Xfinity has been an Absolute NIGHTMARE!

I have absolutely had it with Xfinity. I have had their service for one month, and it has been a NIGHTMARE. First they cancelled my service for no reason one day before my move. Then when I tried to do the installation myself, it would not activate because they cancelled it. When I called they reactivated my account over the phone, but for some reason my bill was now 10 dollars more a month. After I finally got the service working late that night, I noticed that it would freeze up every 20 minutes. The only way to get it to work again would be to reset the unit which took about 5-10 minutes every time. So I called Xfinity support and she told me that they would send a technician to my home but that it would cost me 100 dollars. After I told her over and over to cancel the service and come get your equipment, she assured me that they would remove the 100 dollar charge. The next day the technician came and did nothing. He said the splitter I put on was no good and replaced it with one of his. But that did not fix the problem, as it still froze up after 20 minutes. I told him that the Xfinity box was very hot to which he said: That box needs replaced. I asked him if he had a replacement box on his van and he said yes. But instead of replacing the box, he decided to put a filter on the line. And then he left. I asked him to replace the box because it was overheating, but he insisted that the filter would fix the problem. Well, 20 minutes later it froze up again. I was pretty upset when I called xfinity back, and the girl I spoke to agreed with me that he should have replaced the box. So the next day I drove to the nearest Xfinity store, which was an hour drive, and picked up another box, came home and hooked everything up, and now it works great. Then I find out a week later that they still are charging me the 100 dollar fee for their technician who came out and did nothing but stain my carpet with his dirty shoes.  So I called and after 3 calls I finally got someone who told me the charge would be removed. However 2 weeks later when I get the bill, there it is, the 100 dollar charge for the service call. When I called back they refuse to remove it. I am calling tomorrow to cancel all of my services with them. They have the worst customer service by far of any TV service out there. I will never again make the mistake of using Xfinity.