I advertised on Craig's List Waterloo, Iowa and a man called me from HMG Auction Co. He said he had 2 people interested in buying our tractor and he wanted to auction it on Ebid. He sounded honest but wanted $500 up front to start the bidding. They also were selling several other farm equipment items. It had like 20 days or so on it. Well the final day came and our tractor wasn't even on the ebid site anymore and HMG Auction Co. Had no other equipment on there either. I checked their homepage which I had already looked at several times, and it was gone. No listings at all for them. I owe my Chase credit card $500 and we have not sold our tractor. What can I do? Please help me?