I want to cancel my service. I can't deal with any more awful customer service.

I have been trying for two days to get some resolution. Every time I try to pay my mobile bill, I get an error message. I have tried two cards, the app, the website, different browsers, different devices, clearing browser history, incognito mode, and restarting devices. I had the misfortune of dealing with an "executive relations" employee who was rude, condescending, and ableist. He marked the case as resolved despite the fact that it hasn't been and closed it "at my request," which is a stone-cold lie. I asked for his manager, not to close it. 

During the course of that conversation, I also found out that I was lied to a few months ago. If I had been told the truth, I wouldn't have stayed with Xfinity in the first place. 

Now I'm so upset and angry that I just want to cancel everything since no Xfinity employee shows any interest in honesty or in fixing this.