"Solutions Center" and inability to cancel by phone

I have been trying to cancel my service by calling the number listed on the Xfinity site (1-800-934-6489). I pressed 2 to get service on an existing service. Pressing 1 sent me to a recording saying I could not get assistance with an existing account, and there were no other options given.

The person I reached began by reading a script to sell me an appliance protection plan. I said I didn't want anything new and just wanted to cancel, but he continued repeating the same script. This went on for at least five full minutes, with me declining no fewer than 10 times. When I finally asked if I had actually reached Xfinity, the rep lied and said I must have misdialed because he was here to sell me a protection plan and he was not connected with my provider. I did confirm I called the right number.

I attempted to call back two separate times and got the exact same experience again (one call lasted another 13 minutes before the rep hung up on me), so it is clear that despite this number being listed as the way to cancel on Xfinity's site (https://www.xfinity.com/cancel), this experience is intentional and there is no way to reach someone on the phone who will cancel. Chat will also not allow me to cancel without a phone call. When I attempted to schedule a phone call, the call came in from a number that is not listed anywhere as a valid Xfinity number so I did not feel comfortable giving account details.