Incorrect customer address, never got order packet back to me (sender)

Hi all,

Can anyone advise on the following: amazon provided me with incorrect customer address, I posted with Signed For with tracking number, in two days RM said WRONG ADDRESS. RETURNED TO SENDER, I have never got the packet back despite return address (mine) was in the back of the packet.

I contacted customer explaining he gave a wrong address and he has kept silence since then. Order price £11.

What is the best way to manage this situation?

I am worrying about VTR.

Thank you in advance.