How to speak to a manager? Falsely signed up for Xfinity Mobile against my will by chat agent.

I have been an Xfinity customer for 10+ years, I've never been so close to cancelling and moving to a different provider. 

I reached out to a virtual chat agent regarding a change in my bill. The virtual chat agent promised to help me, but only after telling me about Xfinity mobile.I told him multiple times I was not interested. He kept pushing it on me. I kept asking to return to the original reason I contacted him. He kept talking about Xfinity mobile. He said he would send me free SIM cards and I would not be charged until I activated them. He refused to talk about my original reason for contacting him until I agreed to sign up for the free SIM cards. I agreed because he said I would not be charged.
Of course, I never received the SIM cards and got a bill from Xfinity Mobile. I have spent the past month struggling to fix the problem he caused. I've talked to 4 different agents who promised to solve my problem. I was told multiple times my mobile services would be cancelled and I would not be billed in the future. I got another email of a upcoming bill TODAY. I need this issue escalated. I cannot chat with a virtual assistant because the chat keeps giving me an "error". I've tried calling customer service and I am currently on hold for 30 minutes because the agent is "trying to connect with the mobile team". What is actually going on at this company? I NEED A MANAGER. I need to escalate my issue this whole situation is unacceptable. You all are wasting my time and charging me money for it.

I'm actively looking into AT&T because of how horrible this experience has been - Xfinity has some of the worst customer service I've ever seen in my life. It's appalling how terrible it is, truly.