So a guy bought 60m runescape gp from me. For $62.00. Paypal sent me a message moments after we traded he told his bank it was fraud and is getting a refund. What can i do?
Nothing you can do, sorry to say. This is a scam that simply can't be prevented.
One way to lessen the chances of it happening to you in the future is to have someone send it as a gift with a note attached saying "This is for an item I have already received, and am fully satisfied with. Therefore I agree not to dispute/chargeback".
This way you can argue that the person is just saying the payment is a fraud and trying to scam you. However since that is not evident based on your post, you're out of luck .