Vicious buyer: How to get my item back?

How can I change the return of the item because I made a mistake, I charged the buyer.
Instead of the seller!
Since I am talking to the buyer, he is not responding.
I absolutely want to get my item back.
Because there was really nothing at all.

Hello,

Once you have selected one of the options, you cannot go back.
You can offer to sell your item to the buyer and then buy it. But they must validate the first transaction to avoid other problems.