If you paid with paypal you can open a dispute. They will email the person and if they don't respond or ignore the email, they will put a hold on the money till the problem gets resolved. I had to do it once and it works pretty well. if you didn't pay with paypal, I believe there is a dispute claims center with ebay also.

Good Luck, I hate when jerks do this

Todd Siegel R-7264
New Jersey