Help- What do I do about a retaliatory negative feedback?

[iKarma]

I didn't know where else to put this, so I figured I would put a trading feedback question here. A user sent me a pirated movie. I give him a negative. he then says he wouldn't give a refund until I remove his negatives. I asked him how I could remove feedback?(This was after he ignored me for nearly a month) Then he goes and ignores me for another week or more. I wake up this morning with negative feedback. Obviously I am not going to be sending his movie back until I get a refund. Now I am stuck with a negative because this guy is a jerk! It feels like ebay! I am hoping, really really hoping that bluray.com doesn't support users like this and something can be fixed about this retaliatory feedback...