tried to scam me

im a new guy and I sell account on middleman. i didn't know it pm'd you when they paid, so when this scrub said 'i paid' i pm'd him the password... he says that he canceled because it was already claimed by someone.. no it wasn't! stupid liar tries to take my account, claiming he paid and then trying to make an excuse on why I didn't get my money after I give him the password! NOT a good buyer!