ebay problems?

TODAY I BUY SOMETHING IN EBAY , THE AUCCION SAY THAT PAYPAL WAS ACCEPTED, BUT WHEN I TRY TO PAY A MESSAGE APEARS SAYING THAT,( THE RECIPIENT IS NOT ACEPTING MONEY ) I ALREADY TRY TO CONTACT THE SELLER BUY SHE DON'T ANSWER, SHE CAN OPEN A DISPUTE?IF SHE DO THAT WHAT CAN I DO?