REACTIVATE INACTIVATED XFINITY PREPAID SERVICE

I purchased Xfinity prepaid internet service (and the required modem/router) in December 2021 and prepaid monthly until March 2022, when I returned to my northern home.  Now back in Florida, I am attempting to renew/prepay my service once more but cannot.  Logging into my account doesn't work anymore.  When I enter the code that the system generates, it either says 'Ooops!  There is a system problem.  Try again later.' Or, we cannot find your account.  When I call [Edited: "Personal Information"], this number requires that I provide the phone number associated with the account before I can talk to anyone.  When I provide the phone number, it says that there is no account associated with this number.  Both my email address and the phone number that I am using are correct and as are as entered on my original purchase.  Please help!