Lots of potential to undermine this. Start every customer service interaction with “I’m going to cancel my service”. Make yourself sound angry but don’t attack the representative directly of course (don’t be an asshole). Say you’re angry, definitely. Sense of urgency, and other social engineering techniques.

Companies can’t stop this that easily. If they do, they basically have to try to call bullshit and confront them. Any system that counters this will end up harming normal customers who are generally angry.