The person bought a game from me in August, paid for it, and left me positive feedback. A month later I am notified that this buyer filed a chargeback claim against me and won (because I never received notification of this chargeback and hence was unable to defend myself even though I had plenty of evidence to support myself). I'm not the only one he has done this to either. In the month of September, at least 2 other users reported him of doing the same thing.