If you paid with a credit card via PayPal, call your credit card company to reverse the charges before the time period is up. They want you to do all you can through PayPal, so in your case, the credit card company will open up the dispute. Just have all the information and a note in your account stating the dispute. I had a SNAD with PayPal and at the same time, my credit card company was aware of the situation. I think at one point, they even opened up a case at my request because it was getting close to the expiration date. I just remember faxing them all the evidence and PayPal ruled in my favor, so I called and closed the case with cc company.
p.s. as for your question... I'm not sure about filing with eBay. I remember vaguely that it sent me to PayPal to resolve the dispute.