Samba is a good first step as is IC3
Nitro-
He is a business. Do a web search on attorney general his state-Get the address and file a complaint AND suggest that the other guy from the Samba do the same. Two complaints to the Attorney General with support should get them rattling his cage a bit.
Also-Just my opinion, but I would head to the courthouse in my state and file a lawsuit against this guy in small claims - You have his address.
Nitro-This guy doesnt fear you yet- make him. And you have to do it withhout threats-That wont budge him but a steady attack using all legal means will make him have to play and thats what he is not going to want to do.
Scorp