Accounts set up wrong and overcharging significantly

I’ve called a handful of times and physically gone to a store several times as well. Wasted nearly 14 hours of my time over the course of nearly 3 months with zero resolution and an elderly mother stressed about random large charges coming out of her account that her social security barely covers and leaves her without enough for the week that I then have to cover. All we wanted was to set her up with basic tv/internet/mobile through her ACP preapproval that was originally quoted at an aggregate total of about 35/mo with taxes and fees. Instead they messed up and made an additional account under my own personal account under my name at her address even though I’ve given her information a million times. The most recent charge went through today for $111 to her card. What is going on?!? Everytime I talk to a regular support rep it literally gets worse and worse. A couple weeks ago she was charged nearly $90. Now there’s a charge for an in person technician too. No one has EVER come out to help nor has that ever been offered. I’ve asked to escalate the issue on the phone to get a supervisor to help and flat out told no because they (current rep) can help me.  I need actual help. This needs to be resolved TODAY.