<human>: Almost a week ago now I was running a successful "graphics" shop on the minecraft forums. I did everything, signatures, avatars, banners. Of course it was all done on a very amateur level with picnik.com, but people loved it. Enough people to draw big crowds, and to let me direct attention to other forum subtopics to find more opportunities. Luckily sometimes a few people step up with prizes for such things. 

I found myself with a particular figure who offered a small prize of cash for a good signature. I, out of curiosity, submitted a piece that I personally thought wasn't THAT good.

He accepted it as a winner, and agreed to give me the small sum. I then requested 5 or so dollars for L4D2, which was on sale. 

The guy still hasn't responded. 

Anyway, question is; would I be able to report him, and have any negative actions taken against his account? The guy didn't seem like the nicest, he was often quick with his messages, and promised an amount of money.

Can you give me the gist of the text in a nutshell?
<bot>: I made a guy a signature, he didn't pay up money he promised. Anything I can do to fuck him over?