Bill Not Changed As Representative Promised

Ever since I signed up for Xfinity, they have charged me for Xfinity voice. A year ago they told me that they were getting rid of it for me because I had never used it and is issuing a credit. Last week I found out they were still charging me for Xfinity voice and I had never used it. After the representative talked to me for over an hour they promised to take the $30 for Xfinity voice off and credit me for six months and my bill would drop down to $260. Instead, it is up to 3/300 dollars and I am sick of this company and their lies And not being able to get anyone on the phone to do what they promise that they are gonna do. I have been dealing with them for Internet and for streaming service and their Internet service has been ripping me off for months. I don’t know what else to do to get this rectified. I hate to start all over again with the Xfinity or find another provider, but at this point I am sick of it and I don’t know what to do because you talk to the people for over an hour and they tell you that they’ve done something and then you send them a good good reference because they fix your problem and then you look and see does your bill is twice. The amount is supposed to be anyway this is criminal