My wife and I shared a grandfathered data plan with my mom until she died. My mom didn’t write down her AT&T password or passcode, so whether my wife and I were going to stay with AT&T or switch, the only way to do it was to go the local AT&T store to transfer our lines to an account in my name. When I went there, they told me we weren’t allowed to keep the grandfathered data plan and would have to switch to unlimited. My wife and I use very little data, so I knew at that moment we’d have to switch carriers to get a fair price for the service we need. I set up autopay and paperless billing with AT&T before I left the store that day. 3 days later I ported our numbers to another carrier, and 2 days after that I received our final AT&T bill. I didn’t know until I received this bill that AT&T doesn’t prorate final bills. In addition to charging us an entire month for only 3 days of service, they also took away the $10 per line discount we should have received for setting up autopay and paperless because I canceled our service before the bill was generated. I tried multiple times on the phone and in online chat to make my case to customer service that we were unfairly overcharged. Even if I had conceded I was at fault for not knowing they don’t prorate, they at least should have reinstated the autopay discount when I explained our situation and the reason we canceled our service. Every representative I spoke to gave the same answer: there was nothing they could do unless I reactivated our service. Doing so would have made no sense because my wife and I aren’t big data users.I will absolutely never be an AT&T customer again. They showed no mercy to a grieving family and made us pay $160.32 on our way out the door for only 3 days of service on 2 lines.