Billing Overcharges

I spoke with an Xfinity agent on the phone in January or February. Xfinity had raised the cost of our plan significantly. The agent was great and was able to help and readjust the payment back to $234.82 which we have been paying since. The agent was able to adjust the higher amount down to to the proper amount. This kept us from leaving Xfinity to Verizon and ADT. 

This worked well until a few months ago when the bill became incorrect again. I assumed it would be corrected but now after a few months we still have $188 or so in the overcharges and ironically late fees (we always pay the correct amount on time or early). 

This is about the 5th time in the last 5 years where Xfinity has raised rates a ridiculous amount and at this point even though we have long been loyal Xfinity (and before that Comcast) customers we are thinking about switching to either Verizon and ADT (Verizon is already our cell carrier and never raises rates like Xfinity does) or Metronet with SLING TV and ADT. 

At this point if the $188 isn’t removed and the monthly bill returned to the correct amount I will just pay the $188 and leave Xfinity after more than 10 years as a loyal customer. Can you do anything to help? I did try the Xfinity support bot which was useless and I also tried livechat but they just tried to sell us a cellphone plan to lower the bill. We have less than no interest in changing cellphone service. Also, trying to sell a longterm customer that is being overbilled more services when we already have Internet, TV, and Security through Xfinity is not a great strategy.