Horrible Treatment and Cannot Get Anyone to Helpin

My billing statement says that I have a credit, but the app says I owe a lot of money with no explanation or mathematical sense for why that number exists. I have called billing and at first they assured me that it was an error on my end and that I should go with what is on my billing statement. Now they have shut off my service and are saying that billing never told me this even though I have a clear record of what was said to me. I have tried to get help and they refused to put me on the phone with someone and insisted there is no other supervisor for me to talk to.

This is the latest in a string of so many issues. All stemming from them upgrading my service without authorization. When I called to get it fixed they said that I would be given two free months of service because of my inconvenience and then put it in as $130 disputed charge. Now they have apparently rejected it with no notice and want me to pay that disputed charge when it was never an actual charge. When I called again they said it was an error on their end and that they would put a note in my account so that I don't have any more issues and the note never made it to my account and everyone I talk to is being extremely rude and making me feel crazy.

Is there any number I can call or department I can ask for? I have tried billing twice and one said they would fix it and one insisted there was nothing to fix. I have tried customer retention and nothing. I even asked to speak to someone that handles legal and risk because this is starting to seem like fraud and they said they have no ability to connect me to them. If there is any advice at all I would greatly appreciate it, I am at my wits end.