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1. Sender's Details: Full name, address, and contact information of the complainant

2. Recipient's Details: Company name, address, and department/person responsible for handling complaints

3. Date: Date when the letter is written

4. Reference Numbers: Order number, invoice number, or customer reference number

5. Subject Line: Clear indication that this is a complaint letter requesting replacement

6. Purchase Details: Information about when and where the product was purchased, including price and product specifications

7. Problem Description: Detailed explanation of the issue with the product

8. Impact Statement: Description of how the faulty product has affected the user

9. Replacement Request: Clear statement of the desired outcome - replacement of the product

10. Timeline Request: Specified timeframe for expected response and action

11. Closing: Professional closing statement with signature and name

1. Proof of Purchase: Copies of receipts, invoices, or order confirmations

2. Product Documentation: Photos or documentation of the defective product

3. Communication Records: Copies of previous correspondence regarding the issue

4. Warranty Documents: Copies of warranty cards or guarantee certificates