The shipment could not be delivered due to the customer's wrong address.

I sent messages to the customer many times and stated that the cargo would be returned to me because the address was written incorrectly. However, the customer did not respond to any messages for a long time. And the cargo is returning to me again. Today, the customer sent a message and asked why he could not receive the cargo. I explained and provided the screenshots and the cargo tracking number again, but my account is at risk due to the delivery time. This is an injustice done to me. The customer has not returned any of his messages. In this case, where should I appeal at Amazon? Since the cargo did not reach me, I could not start the return process.