Been there done that, I had a tosser I tried to contact 4 times over a 10 day period over payment for the item they purchased received no reply's left Neg feed so re-listed the item he was onto me in a flash and left Neg feed but the feedback remains there it just says on your feedback "retracted by mutual consent" so like facebook it stays well at least on my account its the only one there since joining in Sept 2004