You continued with the service despite not being paid, and it was your choice to do so - it's a tough lesson to learn, but you can be grateful that you've had it now and you know you'll never do it again. He may even cough up eventually, although probably not.
Attempting to garner help here to threaten, harass and/or blackmail this man (which will mean the only person breaking the law is you) is not going to happen though, so locked.