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1. Sender's Details: Complete business name, address, and contact information of the complaining company

2. Date: Current date of the letter

3. Recipient's Details: Complete name, title, company name, and address of the supplier

4. Subject Line: Clear indication that this is a complaint letter with reference numbers if applicable

5. Opening Statement: Brief introduction identifying yourself and your company, and stating the purpose of the letter

6. Issue Description: Detailed explanation of the problem, including specific dates, order numbers, and nature of the issue

7. Impact Statement: Description of how the issue has affected your business operations

8. Previous Communication: Reference to any previous attempts to resolve the issue

9. Specific Request: Clear statement of what resolution or action you are seeking

10. Timeline Expectation: Specification of when you expect a response or resolution

11. Closing Statement: Professional closing that maintains the possibility of continued business relationship while emphasizing the need for resolution

12. Signature Block: Your name, title, and company details

1. Photographic Evidence: Photos documenting defective products or issues

2. Purchase Documentation: Copies of relevant purchase orders, invoices, and delivery notes

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

4. Quality Reports: Technical reports or quality inspection results if applicable

5. Cost Documentation: Evidence of financial impact or losses incurred