I'm sure everyone has had at least a couple of cases. For me it was when a bank employee performed a cash advance, which I have never, ever consented to in my life, and then claimed I had given her permission to do it. Read: she fucked up and blamed it on me. I requested the contact info of her supervisor, who had the audacity to suggest that it wasn't a large sum of money and I should essentially suck it up. That branch manager got an earful and a half and a phone call from the competition bureau (which was great, because it usually takes multiple complaints for them to take action).

Now this is the Karen-y part. Whenever a company that I'm a regular customer of does something morally wrong (as opposed to a mistake or a less than competent employee), I boycott them until, in my estimation, I've cost them 100x the sum of the initial disputed amount (I have substitute actions for cases that don't have a clear dollar value). In this case I cancelled my credit products with them. My boycott is set to expire (i.e. reach the 100x mark) in February of 2024. The rationale behind this is that if 1% of consumers do it, it'll no longer be worth it for them to continue the practice, and it gives you a satisfying end goal. You can't boycott every company that wrongs you indefinitely - I only have a handful on my permanent blacklist - but I can make my peace with it if I know I've comfortably done my part.