My Xfinity Payment Methods are blocked

To Xfinity Digital Service Representative,

I got an email related to decline my bank payment on 10.08.26.  Tired to update my payment method on Xfinity app but got an error and told me to go to the Xfinity store.  Then, I learned that both my debit card and credit card methods are blocked starting this morning.  The only way was to pay cash in store which i did.  I called Xfinity, and the representative told me my account got a red banner and blocked 6 months, and she could not help.  Could you please lift the ban?  Thank you so much for your help in advance.