Xfinity refuses to close my account

I made a call last Friday to close my account and the lady on the phone removed my card from auto pay and guaranteed me that my account would be closed and I would not be charged anything but once I logged in, I still see that there is a payment that has to be made to $55. I’ve had such a horrible time with Xfinity because I originally signed up for the mobile services while my account with AT&T was suspended and was guaranteed by a customer service worker that I could pay $150 down for an iPhone and get service services but before I did so I personally had to sell my phone for income did it then when I came back was told by another representative that the order couldn’t go through by the last customer service representative because I didn’t have credit on my profile when I was told nothing about this and didn’t even allow an order to go through so I didn’t know what they were mentioning. Since then I’ve been trying to close my account. I haven’t used any of the Internet service or mobile service services and have been just so annoyed with Xfinity for not closing my account