Have ebay verified your bank account, usually done by sending two micro deposits to account, and you respond to ebay, which confirms you have access to the account details supplied.
I notice that a buyer who does not understand the system has left you a neg. Mentions unable to open a return case when what he should be doing is open a NOT RECEIVED CASE, to get a refund.
He would find it very difficult to return an item he has not received.