Why Does XFINITY CUSTOMER SERVICE LIE, AND COMCAST OVER CHARGE MY CREDIT CARD

I have been xfinity client for about 5 years. Originally, contract price was for 40 dollars. They canceled it after 2 years and for the last three years I was paying 50 and last year for some reason 60 (49.99, 59.99 and 69.99 plus 10 for paperless discount.) About 2 years ago, I lost internet and took a week and half for them to send some one out to my home. My job requires internet. I had to be away from my family for a week and half to work because their service provider canceled 3 days in and then i had to wait another week (I live in a suburb). I had to call twice (hours/days of my life) to get the bill pro rated. I had to wait and passed to multiple customer service people. After that,I had to call every few months for them to re apply the discount after I found out they already charged me. They promised that it wouldn't happen again. I had to do that a few times. They have marked my contract price twice with out my permission. They have admitted on the phone that they have lied to me. I Just got off the phone and now saying its a code issue and the only way I can pay less is to recontract with a different contract.  It is in humane their customer service. I have wasted 4 hours the last two days. I have spent hours waiting on the phone being transferred. I have had to recall because they promised a call back and never did. This happens every few months the last two years. They are charging money that I didn't give permission to, they are lying to customers and misrepresenting. Their response I got today was, an apology and they cannot control all their employees. This is insane.