I guess I get all the nuts. A warning sign should have been when he said 'we never pay deposit on future labor'.
We quoted out an access control unit a year ago. The deal was their electrician would do the rough and we would so the final. I showed the electrician what wires to run where and left that we will be called back by the final stage.
Fast forward a few months, we get a call from the contractor to come do the final. We drive up there (2 hours away) and the sheet rock is not up yet. And the electrician had messed up some of the wiring. I explained this to the contractor, he said hook it up and we will take pictures to reconnect later.
We hooked it up and tested it. He paid in full. A few months later we get a call that one of the Rex isn't working. Travel up there and fix it, the person broke the motion exit as well, so a few weeks later sent up a tech to fix it.
About a week ago he texts that it isn't working now (it was when my tech left). I didn't have a chance to reply. He sends an email that we have until the 8th to get it fixed or he will pursue legal methods.
My attitude is that we finished the job and until he pays for the two service calls, no more work should be done. BTW he had paid us with credit card.