If vendors charge you after you unsubscribed, accidentally or not, they're in trouble. File a dispute (it's possible with debit cards, credit cards, SEPA, etc).

If vendors charge you after you unsubscribed, accidentally or not, they're in trouble. File a dispute (it's possible with debit cards, credit cards, SEPA, etc). You'll get a refund and the vendor will get a surcharge. Furthermore, vendors with high dispute rates get shut down pretty quickly by payment processors. Your behaviour is harming you far more than it's helping. This is a feature: You update your details and don't have to individually talk to every single service out there that use the old details. Of course ideally banks would have a way to let the users control these types of features but, you know, banks suck.