Can I report this guy to the authorities?

Hello everyone. I need some quick advice (professional if possible). I work as a graphic artist and was hired for a small gig by this guy ( I won't name him but will provide a link below). He offered me to pay $50 for 2 hrs for the gig. The gig required more time than that but I still agreed. Even though I showed him my portfolio, he still asked for a sample work for his gig. I did a piece of it and he was content. The next day after I finished the whole project, he tells me that now he has changed his mind as the artwork does not make any sense. We were communicating through skype, he asked me to "wait a sec" and then he vanished.

Now here is the link so that you guys don't think I have some kind of personal vendetta towards this guy: http://goo.gl/JbF7IH

Others have said the same thing about him. Now my question is can I report him to the authorities and would it be worth it? My local PD is very rude (from previous experience). To them this kind of stuff probably would be a waste of time. So what should I do? It is just $50 bucks so may be not a big deal but my problem is that this guy repeatedly does this and gets away with it.