That is truly frustrating and disappointing experience. I think you report your problem to the authorities. You can still chase the person and file a case in court. The problem is if he is nowhere to be found.Things gets ugly and frustrating, when you don't receive payment after a service. I was told of a writer who finished his work beautifully and delivered it to the client on time, but what did this writer get in return? No pay. He kept on disturbing the client for donkey years to no avail. Hence, if you were that writer how would you get your payment?