If there's no show at all, or it's completely ruined, then you have them cancel the bill. You don't just refuse to pay and stop picking up the phone. That's childish and we know he doesn't pay bills even when he gets everything he asked for, just more gaslighting.
Plus when I hire someone for a price and they do a meh but ok job, i pay them and never hire them again. That's how the free market works, at least in theory. He doesn't see we can't just "not pay our bill" when my internet goes down for a few hours. Normal people get fucked by that, he doesn't know what normal is. Weird they don't even realize they're saying the quiet part out loud.