I was scammed on ebay by a fraudulent seller. He's swindled many many people who have now contacted me since leaving a negative comment on the person's history. Paypal has refunded me only part of the money (less than half), and it's a large sum I don't want to lose. What should i do? I already paid my credit card bill, so I'm not sure if I can talk to the credit card company. Any help would be very appreciated