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

2. Recipient's Details: Complete details of the company/person being complained to, including department if applicable

3. Subject Line: Clear identification of the letter as a formal complaint, including reference numbers if available

4. Purchase Information: Details of when and where the machine was purchased, including order/invoice numbers

5. Product Description: Specific details about the machine including model number, serial number, and intended purpose

6. Problem Description: Clear and detailed explanation of the malfunction or issues experienced

7. Timeline of Events: Chronological account of when the problem started and any attempted solutions

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

9. Impact Statement: Description of how the malfunction has affected business/personal use

10. Specific Request: Clear statement of what resolution is expected (repair, replacement, refund)

11. Closing Statement: Professional closing including expected timeframe for response and any legal implications

1. Purchase Documentation: Copies of receipts, invoices, or purchase orders

2. Warranty Certificate: Copy of warranty card or guarantee document

3. Service Records: Documentation of any repairs or maintenance performed

4. Photographs: Visual evidence of the machine's malfunction or damage

5. Technical Reports: Any professional assessments or repair attempts documentation