has one of you guys ever had an aggressive customer? The type that says to come visit your office to break everything out of anger? I had that experience today.

Bill him for damages

I had a manager back in the day who lived for customers like that. He'd call them and say "If you ever talk to us like that again, we're cancelling your contract, and you can take your business elsewhere." It was a glorious thing to watch. He'd have this huge smile on his face throughout the entire phone call.