Help

I have been trying to get my statements corrected for the agreement that I made. After hours on the phone I get nowhere other than promises will take care of it which is never done. They sent me a dead box and then had to send a technician out to replace it and told me they might bill me for a service call in which case to let him know that the box was dead which I did at least a half a dozen times now and I still cannot get credits for the service call. I also signed up through another company and was quoted a price of $105 for the service and yet I am constantly billed $175. I just want to get to settled once and for all and never use XFinity again they are without a doubt the worst company to deal with in the United States