My Pinterest account got locked for no reason. I found a video which said "just bug the shit out of them", so every day I put in an appeal which was rejected every single time for about 3 weeks and then someone said "fuck it" and unlocked it.

On the flip side, I had a bank account with Square (now Block) and their support took me to a dead end, so I called one of their executives on his cellphone and politely explained the problem to him. That got my account fully terminated with no recourse.