Hi everyone. Thanks so much for all of your responses. I finally got a reply from the seller and here's what he had to say:

"We are sorry. We had extra help during this month for the added holiday crunch. We had two auctions, one for a nicked set and a clean set. Shipping sent the wrong set out to you and the other customer. We have no more of these wheels. We were just selling them for our cost so that we did not have to move them to our new warehouse. We can either give you a $50 refund or we can pick up the wheels and when they arrive back here we can do a full refund. Just let us know what you would prefer."

Ugh....it's just my luck! I am glad that the seller is actually accepting responsibility. But I haven't decided yet what I'm going to do. I'll keep you posted.