Pay bill for deceased parent

My dad entered hospice care January 15. When we moved him out of his apartment and into hospice, I returned his equipment to a local xfinity store on January 17. The store sent the bill for his remaining balance to my address.

Dad died soon after we moved him. And I've got his last bill sitting in front of me. I just want to pay it. I can't pay online because I don't have his Xfinity ID. I tried to pay by text, but despite entering his account number into the system, I'm not getting a link to his remaining balance.

I've just spent 25 minutes in phone tree [Edited: "Language"] trying to pay his remaining balance. I have the account number. I just want to pay the outstanding balance. The customer service person I spoke to said I needed to BRING the customer into a store to pay the bill for them. He said BRING the person AFTER I explained that my Dad died. I asked the CSR - so I'm supposed to [Edited: "Language"] into an xfinity store? 

I asked to speak to his manager. He told me no manager was available. I asked to speak to his managers manager. He also didn't listen to my name and kept calling me by my Mom's name (which was still on the account). Mom died in 2020. So yeah, thanks for that too. The CSR again said no manager is available. I said I'd wait for someone to become available, then he hung up on me.

So wow - no managers are available ANYWHERE among the 185,000ish people who work for Comcast to help me pay Dad's last bill. I've got power of attorney. I have death certificate. I have a bill with the account number. 

It seems that Comcast/Xfinity's policy for grieving families is to make things as DIFFICULT as humanly possible. There are no privacy issues because I am not asking for any information (and also I have the POA and death certificate). I just want to give you my credit card number to make a payment on someone else's account.

I honestly don't get it. I could just not pay this bill. If I tear it up, you'll never get your money (unless you've got a collections agency in the afterlife).

Why is this so hard?