I'm having a problem with a web client right now. He has breached contract a long time ago and I haven't even been paid HALF for the job (it's been 4 months). I finished the site and he keeps requesting changes. It seems like I'm working for free at this point. He keeps promising to pay in full in a week and each week something happens.

He's having another amateur artist (that learned Photoshop from a cereal box) create a template (that's crappy) and having me work from that. He calls at all hours of the night (last night 12:40am) and at this point I really want to drop the contract. I'm not really getting paid properly. I guess I just feel bad b/c he's a small business owner. What would you do?