How to Write a Letter of Complaint: Examples & Best Practices


1. Understand the Purpose of a Complaint Letter

A complaint letter is a formal way to address a problem with a product, service, or experience. It should:

  • Clearly state the issue
  • Provide relevant details and evidence
  • Request a reasonable resolution
  • Maintain a professional and polite tone

Writing an effective complaint letter increases the chances of receiving a timely and satisfactory response.


2. Structure of a Complaint Letter

A well-written complaint letter should follow this format:

  • Your Name
  • Your Address
  • Your Contact Information
  • Date
  • Recipient’s Name and Title
  • Company/Organization Name and Address
  • Subject Line: “Formal Complaint Regarding [Issue]”
  • Introduction: Briefly explain why you are writing
  • Description of the Issue: Provide details about what happened
  • Previous Attempts to Resolve It (if applicable)
  • Requested Resolution: State what you expect to happen
  • Closing Statement: Request a response within a reasonable timeframe
  • Your Signature

3. Complaint Letter Examples

Example 1: Complaint Letter About Poor Customer Service

[Your Name]
[Your Address]
[City, State, ZIP Code]
[Your Email]
[Your Phone Number]
[Date]

Customer Service Manager
[Company Name]
[Company Address]
[City, State, ZIP Code]

Subject: Formal Complaint Regarding Poor Customer Service

Dear [Manager’s Name],

I am writing to formally complain about the poor customer service I experienced at [Company Name] on [Date]. During my visit/call, I encountered [describe the issue, e.g., rude behavior, lack of assistance, misinformation].

Despite my attempts to resolve the matter with your staff, I was met with unprofessional conduct, which left me dissatisfied with the service provided. I have been a loyal customer of [Company Name], and I expect a higher standard of service.

I kindly request an investigation into this matter and appropriate corrective action to ensure better service for customers in the future. Please provide a response within 14 days outlining the steps that will be taken to address this complaint.

Thank you for your time and attention. I look forward to your response.

Sincerely,
[Your Full Name]


Example 2: Complaint Letter About a Faulty Product

[Your Name]
[Your Address]
[City, State, ZIP Code]
[Your Email]
[Your Phone Number]
[Date]

Customer Service Department
[Company Name]
[Company Address]
[City, State, ZIP Code]

Subject: Formal Complaint Regarding Faulty Product – Order #[Order Number]

Dear [Customer Service Manager],

I purchased a [Product Name] from your company on [Purchase Date], and unfortunately, it has not functioned properly since I received it. The issue I am experiencing is [describe the defect or problem].

I contacted customer support on [Date], but the assistance provided did not resolve my issue. I am disappointed with the product’s quality and the inconvenience caused.

I kindly request a replacement or a full refund for the faulty product. I have attached copies of my receipt and photos of the defect for reference. Please respond within 14 days with a resolution to my complaint.

Thank you for your prompt attention to this matter.

Sincerely,
[Your Full Name]


Example 3: Complaint Letter About a Late Delivery

[Your Name]
[Your Address]
[City, State, ZIP Code]
[Your Email]
[Your Phone Number]
[Date]

Customer Support Team
[Company Name]
[Company Address]
[City, State, ZIP Code]

Subject: Formal Complaint Regarding Late Delivery – Order #[Order Number]

Dear [Company Representative],

I placed an order with your company on [Date], with an expected delivery date of [Expected Date]. However, my order has not yet arrived, and I have not received any updates regarding its status.

I have attempted to contact customer service multiple times, but I have not received a satisfactory response. This delay has caused inconvenience, as I needed the item for [mention reason, if applicable].

I request that my order be delivered immediately or that I receive a full refund. Please provide an update within seven days on how you plan to resolve this matter.

Thank you for addressing this issue promptly.

Sincerely,
[Your Full Name]


Example 4: Complaint Letter About Overbilling

[Your Name]
[Your Address]
[City, State, ZIP Code]
[Your Email]
[Your Phone Number]
[Date]

Billing Department
[Company Name]
[Company Address]
[City, State, ZIP Code]

Subject: Formal Complaint Regarding Incorrect Billing – Account #[Account Number]

Dear [Billing Manager],

I am writing to formally dispute an incorrect charge on my recent bill from [Company Name]. On [Billing Date], I was charged [$XX] for [describe incorrect charge], which does not match the terms of my contract or previous billing amounts.

I have reviewed my statements and contacted customer support on [Date], but the issue has not yet been resolved. I request an immediate correction of my bill and a refund of the excess charge.

I have attached copies of my previous bills and receipts for your reference. Please respond within 10 business days to confirm the correction has been made.

Thank you for your prompt attention to this matter.

Sincerely,
[Your Full Name]


4. Key Tips for Writing an Effective Complaint Letter

  • Be clear and concise – Avoid unnecessary details and get straight to the point.
  • Stick to the facts – Keep your complaint factual and professional.
  • Use a polite and respectful tone – Avoid aggressive or rude language.
  • Provide evidence – Attach receipts, emails, or photos to support your claim.
  • State your desired resolution – Clearly explain what outcome you expect.
  • Request a response within a deadline – This encourages prompt action.

5. Frequently Asked Questions

1. Should I send my complaint letter by email or mail?
Most companies accept complaints via email, but for serious issues, sending a physical letter via certified mail can add more credibility.

2. How long should I wait for a response?
Companies typically respond within 7-14 business days. If you don’t hear back, follow up or escalate the complaint.

3. Can I take legal action if my complaint is ignored?
If the complaint involves financial loss, consumer rights violations, or serious misconduct, you may consider contacting a consumer protection agency or seeking legal advice.

4. What should I do if my complaint is rejected?
If the company refuses to resolve the issue, escalate your complaint to a regulatory authority, consumer watchdog, or social media channels to raise awareness.

5. Can I demand compensation in my complaint letter?
Yes, if the issue caused financial loss or inconvenience, you can request a refund, replacement, or other compensation.


Conclusion

Writing a complaint letter effectively requires professionalism, clarity, and supporting details. By following the structure and using these examples, you can ensure your complaint is taken seriously and resolved in a timely manner.

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