contact ebay with full details. some people cause a problem and then try to blame the buyer. Ebay will see you have acted in good faith and can remove any unpaid item strikes. I was advised by ebay themselves not to pay on one item, because the person had a history of claiming there was something wrong with their paypal account and asking for cash instead. Tell ebay you don't feel you can trust the seller any more. all you can do about feedback is return and follow up and try to explain the truth rather than giving insults. ebay may remove it at their discretion