Charges on deceased act going on 12Months

I have been charged for 12 months on my dead dad’s acct I have sent the death certificate 20 times. I have called biweekly for 365 days this year, being told my dad needs an id/ verify. Claiming they don’t have death cert and need it again. I am supposed to receive a refund instead I keep getting charged and bills that are constantly getting higher and higher. When I call I get 0

help being told me or my father do not have service with Xfinity. I am going to file a claim if this is not resolved immmediately. I have spoken to billing csr fraud the store every person has just messed it up more. I’ve had enough please figure this out now .