yeah had exactly same problem trying to sell my old car..f*kin jokers, And the system works so trying to put in a complaint is a waste of time, and you cant leave bad feedback..
I got the contact details of the last joker and rang him, he was stunned, i said to him," you bought my car on ebay", he goes "hey,what, how'd you get this number, dont know what your talking about"
..Yeah whatever dickhead.
I put in a complaint and ebay tells you they have sent him a message, which he conveniently ignores, so instead ,to get my money back, i send him a cancel transaction email which he replied to instantly..
But I do have his full contact details now so theres always prank calls and molitov cocktails at 2 in the morning
GL with your sale mate..