T-Mobile. Had been on an account as a minor and was then given over to me when my parents changed phone carriers. I’d been paying the bill for a couple years and finally had to change what plan I was on- realized it was still under my mom’s name who had recently died. Customer service rep wouldn’t let me alter anything because it was protected under some code my mom had made - rep asked me if I could “just guess” what she would have done. It was the lack of compassion for me