When writing a complaint letter to a business:

• Stick to the facts. Write a brief summary of what has transpired or use a timeline format. Note any verbal promises or guarantees the seller made.
• Include photocopies of all receipts, contracts, warranties, guarantees and/or other relevant documents.
• Explain what kind of resolution you are seeking. Give the business a reasonable amount of time to respond.
• Be polite, and don't threaten.
• Keep a copy of the letter for your records and, if sending the letter by mail, do so through registered mail and keep the receipt.
• Type the letter, if possible. If it is handwritten, make sure it is neat and easy to read.
• Include your name, address, home and work phone numbers and the date.