How do you write a complaint letter about a faulty product?

Open with the purchase facts: brand, model number, where and when you bought it, and the order number. Then describe the specific failure and when it started, list what you have already tried through customer service, and name one remedy with a response deadline. Attach the receipt and any photos of the defect.

What should a complaint letter for poor quality of a product include?

Model and serial numbers, the purchase date and seller, the date the problem appeared, exactly what fails and how often, your support case numbers, and the resolution you want. If the item is under warranty, say so in one sentence. Detail the company can verify in its own records is what moves a claim along.

How do you write a complaint email about a product?

The same content, shortened. Put the model and order number in the subject line, keep the body to three short paragraphs (what you bought, what failed, what you want), and attach the receipt and photos rather than describing them. Email also date-stamps the complaint, which helps if you later need to show when you first reported the defect.

How do you write to a supplier about poor quality goods?

Reference the purchase order or invoice number, state the quantity affected and the defect rate, and describe the failure against the agreed specification rather than against your expectations. Say what you want: replacement stock, a credit note, or a return authorization, and give a date. Keep the tone commercial, since the goal is usually to keep the account, not to end it.

What if the company does not respond to your product complaint?

Send one short follow-up that references the original letter by date and repeats the request. If that goes unanswered, your options include a Better Business Bureau complaint, your state attorney general's consumer protection division, a chargeback with your card issuer if you paid by credit card, or small claims court for larger amounts.

Complaint Letter to a Company About a Product

Documenting the Product Issue Clearly

Before you write anything, get the facts in front of you. Pull out the receipt, the order confirmation email, the warranty card, or the product packaging. You need specifics, and specifics are what separate a complaint that gets resolved from one that gets filed away.

Your complaint letter about a product should answer these questions in the opening paragraph:

What did you buy? (Brand, model name, model number)
When did you buy it? (Date of purchase)
Where did you buy it? (Store name, website, order number)
What went wrong? (Specific defect, failure, or discrepancy)

Here is what that looks like in practice: "On November 3, 2026, I purchased a Breville Barista Express espresso machine (Model BES870XL) from Williams Sonoma, order number WS-2847291. After six weeks of normal use, the steam wand stopped producing steam entirely."

That is one paragraph. It tells the company everything they need to locate your order and understand the problem. Compare that with: "I bought one of your coffee machines and it stopped working." The second version gives them nothing to act on.

Sample Complaint Letter for a Defective Product

Here is a complete letter about a specific failure: a dishwasher that stopped draining fourteen weeks after it was installed.

February 9, 2026

Customer Relations
Larkmont Appliance Company
1200 Industrial Parkway
Columbus, OH 43215

Re: Larkmont DW-720 dishwasher, serial #LK7204418823, order [your order number]

Dear Customer Relations,

On October 18, 2025, I bought a Larkmont DW-720 dishwasher from Ridgeway Appliance in Columbus, Ohio. It was installed on October 24. On January 30, 2026, after fourteen weeks of normal household use, the unit stopped draining. Water now stands in the tub at the end of every cycle and the control panel shows error code E4.

I called your support line on February 2 and spoke with a representative named Alicia, who walked me through clearing the filter and resetting the unit. I did both. The error returned on the next cycle. I called again on February 5 (ticket #LK-559214) and was told a service technician would contact me within 48 hours. No one has called.

The dishwasher is within its one-year manufacturer's warranty, which covers defects in materials and workmanship. I am requesting warranty repair at no charge, with a service visit scheduled within ten business days of this letter. If the drain assembly cannot be repaired, I would accept a replacement unit of the same model.

Please confirm by February 23, 2026. You can reach me at (614) 555-0172 or at t.brennan@example.com. I have attached the receipt, the warranty registration, and two photographs showing the standing water and the error code.

Sincerely,

Thomas Brennan
4417 Sherwood Road, Columbus, OH 43214

What this sample does:

Puts the identifiers where a support agent looks first. Model, serial, and order number sit in the Re: line, so the file can be pulled before the complaint is even read.
Dates the failure against the purchase. October 18 to January 30 is the whole warranty argument in two numbers, and it forestalls any suggestion that the unit was old.
Describes the symptom, not the diagnosis. Standing water and error code E4 are things the writer observed. Guessing at the failed part would invite a correction instead of a repair.
Shows the normal channel already failed. Two calls, one representative by name, one ticket number, one broken callback promise. That is what makes a written escalation reasonable.
Names one remedy with a fallback. Repair first, replacement if repair is not possible. Listing five acceptable outcomes reads as uncertainty.
Ends with a date, a phone number, and an email. The company cannot claim it did not know how to reach you or when you expected an answer.

What You Have Already Tried to Resolve It

Companies are more responsive when they can see that you have already attempted to fix the problem through normal channels. This is not about proving you are a patient person. It is about showing them that their standard process failed, which makes escalation reasonable.

Include a brief timeline:

"On December 15, I called your customer service line and spoke with a representative named Marcus, who suggested I reset the machine. I followed the instructions. The problem persisted."
"On December 18, I called again and was told a supervisor would call me back within 48 hours. No one called."
"On December 22, I sent an email to support@company.com (ticket #44891). I received an automated response but no follow-up."

This timeline does two things. It demonstrates that you gave them a chance to handle it informally. And it creates a paper trail that shows the company is already aware of the issue.

Requesting a Refund, Replacement, or Repair

Name exactly what you want. Companies respond to clear requests, not general dissatisfaction.

For a refund: "I am requesting a full refund of $699.95 to the original payment method (Visa ending in 3847). Given that the product failed within the warranty period and two attempts at resolution through customer service have not produced a result, I believe a refund is appropriate."

For a replacement: "I am requesting a replacement unit shipped to my address at no additional cost. The defect appears to be a manufacturing issue, not a result of misuse."

For a repair: "I am requesting that the unit be repaired under warranty at no charge, with prepaid shipping for the return. If repair is not possible, I would accept a replacement."

Pick one primary resolution. You can mention an alternative ("If a replacement is not available, I would accept a refund"), but lead with your preferred outcome. Listing five different things you might accept makes you look uncertain about what you actually want.

Referencing Warranty or Consumer Protection Rights

If the product is under warranty, say so directly: "This product is within the one-year manufacturer's warranty, which covers defects in materials and workmanship."

If you purchased an extended warranty or protection plan, reference the plan number and the relevant coverage terms.

Even without a warranty, you may have rights worth mentioning. Most states have implied warranty laws that cover products for a "reasonable" period. The Magnuson-Moss Warranty Act is a federal law that protects consumers when written warranties are offered. You do not need to cite legal code in your letter, but you can reference these protections generally.

For example: "I understand that [state] consumer protection law provides for implied warranties of merchantability, which I believe applies to a product that failed after just six weeks of normal use."

Do not overdo it. One sentence referencing your rights is effective. Three paragraphs of legal language sounds like you copied and pasted from a template, and the person reading your letter will stop taking it personally.

Credit Card Protections

If you paid by credit card and the company is unresponsive, you can also file a chargeback dispute with your card issuer. Mentioning this in your letter (briefly) signals that you have a backup plan: "If this matter cannot be resolved directly, I will be filing a dispute with my credit card company under the Fair Credit Billing Act."

Following Up if You Do Not Hear Back

Give the company the deadline you stated in your letter (10 to 14 business days is standard). Mark the date on your calendar.

If the deadline passes without a response, send a follow-up letter. Keep it short:

"On [date], I sent a complaint letter regarding [product and issue]. I requested [resolution] by [deadline]. I have not received a response. I am writing to reiterate my request and to inform you that I will be filing complaints with the Better Business Bureau and [your state]'s consumer protection office if this matter is not resolved within the next 10 business days."

This is not a threat. It is a factual statement about your next steps. Most companies prefer to resolve issues before they become regulatory complaints, so this kind of follow-up often produces a faster response than the original letter.

If the company still does not respond, follow through. File with the BBB. File with your state attorney general's consumer protection division. If the amount is significant, consider small claims court, which typically handles disputes under $5,000 to $10,000 depending on your state.

Getting Started

A product complaint letter works when it is specific, reasonable, and direct. Document the problem, show what you have already tried, name what you want, and give them a deadline.

If you need help organizing the details of your product complaint, LetterLotus's complaint letter questionnaire asks the right questions so you do not miss anything that could strengthen your case.