Re:
did you follow the forum rules regarding payment? meaning normal paypal so you can get your money back should anything go wrong?
people get stitched up on any forum, it's not the forums fault.
while i sympathise with your situation retrobike is not immune to people who are crappy sellers, so to moan with no specifics is quite pointless. there is a dispute procedure but basically it amounts to us sending a message to that person, we are not the internet police but we try to help if we can.