+1 on notifying Angie's List. They take that stuff seriously. Good on you for keeping the emails. I'd probably want to show them to a lawyer and get their opinion. That is an out and out shake down. I'm stunned. And I imagine that a Cease and Desist letter on a law firms letterhead would go a long way towards silencing this idiot. But if he trashes you, I'd be prepared to go after him. Your good name is worth too much not to. Do you have pictures of the job?