Complaint Letter template.

A formal complaint letter explains a problem with a product, service or organization, includes reference details and evidence, and asks for a specific resolution within a reasonable time.

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Complaint Letter template example on professional letterhead

When to use it

Faulty products or poor service
Billing errors and overcharges
Complaints to landlords, councils or institutions

What's included

Branded letterhead with logo and contact details
Subject line: FORMAL COMPLAINT — SERVICE FAILURE
Summary box: Complaint Reference, Service / Product, Incident Date, Resolution Requested
Signature block and company seal

How to adapt this complaint letter

Before you write

Gather the order or account reference, event dates and relevant evidence.
Choose a specific remedy, such as repair, replacement, refund or correction of a bill.

A practical example

For an incorrect renewal charge, identify the account and invoice, show the agreed price and actual charge, and request correction of the difference. Attach the invoice and relevant agreement.

Common mistake to avoid

Do not request a refund in the summary while asking for a different remedy in the body. Avoid exaggerating losses you cannot explain.

Before you send

Use the company's complaints channel and check any response or escalation procedure. Keep copies rather than sending your only originals.

Fictional sample details are starting points to replace. Letter Studio formats documents; a logo, signature or stamp does not verify their contents or confer authority.

Sample text

Complaint Letter example

This is a fictional example. Highlighted words use your editor details; replace all other sample names, dates, figures and bracketed instructions before sending.

Subject: FORMAL COMPLAINT — SERVICE FAILURE

Dear Customer Services Manager,

I am writing to formally register a complaint regarding the unsatisfactory service and significant disruption caused by the recent failure in your enterprise software licensing system.

On September 1, 2026, our organization experienced a critical service outage directly attributable to an error in your renewal processing system, resulting in a complete loss of access to licensed software for approximately 48 hours. This outage caused substantial operational disruption, financial loss, and reputational damage to our clients.

We have previously attempted to resolve this matter through your standard support channels without adequate resolution. We are therefore formally escalating this complaint and requesting a full written explanation, a comprehensive service credit, and a formal apology within 10 business days.

Complaint Reference: CMP-2026-0071
Service / Product: Enterprise Software Suite — License Renewal
Incident Date: September 1, 2026
Resolution Requested: Service credit and written apology

We trust this matter will receive your immediate and personal attention.

Yours faithfully,
Elena Rostova

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FAQ

Complaint letter questions.

What should a complaint letter include?

A good complaint letter clearly states complaint reference, service / product, incident date, resolution requested, along with the date, recipient details, a clear subject line and a signature. This template includes all of them, ready to edit.

How do I write an effective complaint letter?

Explain what went wrong with dates and order or account numbers, attach evidence, say clearly what you want (a refund, repair or replacement), and give a reasonable deadline.

Who should I address a complaint letter to?

The company's customer service or complaints department, or a named manager if you have one. Keep a dated copy for your records.

Is this complaint letter template really free?

Yes. The complaint letter template is free to use, with no watermark and no limits on downloads.

Can I add my logo, signature and company stamp?

Yes. Upload your logo, draw or upload your signature and add an company seal or stamp. Everything is placed on the letter automatically and stays sharp in the PDF.

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