xfinity failure to use credit card on file for payment.

We have a credit card on file with Xfinity for payments.  Xfinity sends us a bill that we are 60 days late on our payment. BUT exfinity had our valid card on file. This will cause damage to our credit rating. the only msg I could get, there is no one to talk to, I finally found a msg that said "unknown error occurred" 60DAYS after it happened. Please let me know when you will send a notice to  credit agencies that we were not 60 days late in our payments.