Xfinity unable to accept payment

I’m on autopay. Last month the payment didn’t go through. I thought maybe the card expired. I signed on, tried the pay now button, but instead of letting me enter a different card, it said to go into a store.  I called Xfinity and they were unable to get to the payment screen to accept payment, they said to visit a store. I went to a store, and when he pulled up the screen to make a payment - it said… visit a store! No one has been able to accept a payment from me. Customer service has made notes in my account about my attempts, but I worry some glitch in the system may interfere with my service that I need for work.