If an automated system is making the decision to cancel a customer's account, then companies should be required to give cancelled customers a way to speak to a human about the inevitable false positives.

They do what they want and you (or me or anyone else not on the board of directors) don't have any say over it. They could even have a daily lottery that randomly chooses a couple of people and have all their accounts permanently frozen/closed/cancelled with no recourse at all, ever.