I had a free checking account with TCF National bank (US). After getting hit number of times with overdraft fee, I went to my local branch, asked for a manager

I had a free checking account with TCF National bank (US). After getting hit number of times with overdraft fee, I went to my local branch, asked for a manager and explained that I want to disable overdraft protection on my checking account. Manager told me he can't do it and that I have to write a letter (they didn't have any forms for that) explaining things and send it to their HQ. Needless to say, I closed my account the same day.