I had some tosser do it on a games console I won with loads of games for £25 not so long back.
They emailed me as soon as auction ended to say it was sold the week before and eBay refused to let them end it (more bullish).
I said don't take me for a fool and I was coming to get it yet they said there was no point as it had gone. They told me to just give them the neg feedback.
I just left it at that, I didn't give them the neg feedback but if it happens again with anyone else I would as I'm sick of being messed around on there.
At least my seller had the decency to speak to me.
If I were you willo I'd give neg and explain why, ignorant asshole, hate people like that.