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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 relevant department (usually Customer Service or Sales Department)

3. Date: Date of writing the complaint letter

4. Reference Numbers: Order number, invoice number, customer reference number, and any other relevant identifiers

5. Subject Line: Clear indication that this is a complaint regarding wrong delivery

6. Order Details: Description of what was originally ordered, including quantities, specifications, and agreed delivery date

7. Description of Issue: Detailed explanation of what was incorrectly delivered and how it differs from the original order

8. Impact Statement: Description of how the wrong delivery has affected you or your business

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

10. Timeline for Resolution: Reasonable deadline for when you expect the issue to be resolved

11. Closing Statement: Professional closing with clear call to action

1. Proof of Purchase: Copy of original order confirmation, invoice, or receipt

2. Delivery Documentation: Delivery note, shipping label, or any delivery confirmation documents

3. Photo Evidence: Pictures of the incorrectly delivered items

4. Communication Log: Copies of previous emails, chat logs, or correspondence about the issue

5. Cost Impact Statement: Detailed breakdown of any financial losses or additional costs incurred