Overbilling

On 7/7/26, I terminated Xfinity internet service started on 6/14/26 due to a number of service issues. I signed up for 1g service with upload speeds up to 100mbps. My uploads were consistently between 70 to 80 mbps which was inadequate for my 4k outdoor cameras so on 6/19/26, I upgraded to 2g service with upload speeds up to 300 mbps. I still only got upload speeds between 70 to 80mbps. After numerous chats and calls with tech support a tech was sent out that I was told I would NOT be billed for on 6/30/26, and he told me that he removed a line block that prevented me from getting the advertised upload speeds that came with the 2g download. The next morning, 7/1/26, my internet went down completely. When I called tech support, I was told the issue was not in my home, but with the broadband signal coming to my home and a technician was scheduled between 1pm and 3pm the next day, 7/2/26. That tech never showed although I chatted and called several times as I was completely down. I was told the tech was running late and would be here at 4:30pm. It was after 5pm before I was told the appointment would have to be rescheduled and the earliest would be Monday, 7/6/26, so I requested a call back from a manager. I got a call after 6pm from someone at Xfinity identifying himself as a manager and stated there was nothing he could do about the 7/6/26 earliest available tech service date, however, he would see that there was no charge for it. After being completely down with no internet from 7/1 to 7/6, the tech came and determined that the modem/gateway just needed to be swapped out. I was livid!! I was down without internet from Wednesday to Monday afternoon (over a holiday weekend) when I could have gone to the Xfinity store, swapped out the modem/gateway myself and had 30 minutes to an hour down time instead of 5 days! I cancelled Xfinity the next day. When I saw the final invoice for $112.95, I spent 40 minutes on the phone with an agent (identified himself as Chris), explaining that the bill showed a credit for the Self-install Plus ($43.89) that I agreed to when I signed up. What should have been removed was the $100 + tax fee that I was promised wouldn’t be charged. The total pro-rated amount of my bill should be 5 days of 1g = $10.23 + 14 days of 2g = $44.98 + $43.69 for a total of $99.10. However, I made a payment on 7/5/26 of $45.09 … so the balance should be $54.01, not $112.95. Please advise.