I have had similar problems with PayPal. They are totally useless and you will be very lucky to get your money back.

Register with Money Bookers (www.moneybookers.com) they do the same a s PayPal but they also have an 'escrow' account. that means they hold the money until you and the buyer are happy.

Perhaps Boonex can run a a similar payment system which can accept PayPal, moneybookers and various credit cards. I want to buy some mods but most people on here don't accept moneybookers.