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1. Sender's Details: Full name, address, contact information, and customer reference number if applicable

2. Recipient's Details: Company name, department, address, and if possible, specific contact person

3. Date: Date when the letter is written

4. Subject Line: Clear indication that this is a complaint letter with reference to the specific product

5. Product Information: Details of the product including name, model, serial number, date and place of purchase

6. Problem Description: Clear and detailed explanation of what is wrong with the product

7. Impact Statement: Explanation of how the defective product has affected you

8. Previous Contact: Summary of any previous attempts to resolve the issue

9. Requested Resolution: Clear statement of what solution you are seeking (refund, replacement, repair, etc.)

10. Closing: Professional closing with expected timeframe for response

1. Purchase Receipt: Copy of original purchase receipt or invoice

2. Product Photos: Photographs showing the defect or damage

3. Previous Correspondence: Copies of any previous emails or letters regarding the issue

4. Warranty Card: Copy of warranty card or guarantee certificate if applicable

5. Expert Report: Any technical reports or assessments of the product defect, if available