that sucks because that person is putting a bad name to those poeple who sell online and are honest about what is sold.
anyway i would start a case vs them and upload the pics to ebay and paypal in the case showing that the numbers dont match. start a case on both ebay and paypal just to do it because thats all bullshit what happened to you. be clear in what you say and dont sound like your too pissed you know?
ive played this game on ebay before and they wil back you if you were wronged