Amazon says you returned the "wrong item."

The proof of identity

• The serial number. If you photographed it — or it sits on the product box you kept, in the manufacturer's app, or in a registration email — it identifies your exact unit. A "wrong item" claim against a serial-matched return is a warehouse error on paper.
• The weight receipt. The wrong-item claim and the empty-box claim die by the same number: your package's recorded weight vs. the item's real weight.
• Packing photos or video. Even a photo of the item next to the return label reframes the case.
• Fulfillment matters: if the order was sold and shipped by a third-party seller rather than Amazon, the "wrong item" record may be the seller's claim, not a warehouse scan — dispute it as such, in the same reply, and note the difference. Amazon grades those records differently.

Why this one matters beyond the refund

A wrong-item denial isn't only about this refund. Return-integrity records accumulate: enough of them and the next letter is the warning letter — or a closure. Getting a wrong record corrected, in writing, protects the account as well as the money. Ask, in your reply, for the record itself to be corrected — not just the refund paid.

The doors, in order

1. Reply to the denial with serial + weight + photos, and the explicit request: correct the record, then release the refund.
2. The account appeal form if the reply refuses.
3. Executive Customer Relations (ecr-replies@amazon.com) with the identity pack.
4. BBB complaint — the same pack; the paper trail matters if the record is ever cited against you again.