Charged for months after in-store cancellation – service stopped since June, account holder is deceased

Hi,
I am posting here because this issue has gone unresolved for months and I am beyond frustrated.
Here is the timeline clearly:
 -The Xfinity account is under my deceased husband’s name
 -The payment method on file is my credit card
In June, a family member went in person to an Xfinity store to cancel the service. Since June, the mobile phone service has been completely stopped / unusable.
Despite this, my credit card has been continuously charged starting.

To be very clear:
 -The service has not been usable since June, after the in-store cancellation request.
 -There has been no active phone service, yet billing continued .

I contacted Xfinity multiple times and was told the charges would be “reviewed,” but the charges never stopped.
Because of this, I had to file multiple disputes with my credit card company.
I even replaced my credit card, yet the charges still continue due to recurring billing.
This is now clearly a case of unauthorized recurring charges for a service that was canceled and never provided, on an account belonging to a deceased account holder.

I am requesting:
 -Immediate termination of the account
- Permanent stop of all future charges

This situation has caused unnecessary financial and emotional stress.
I am asking for this issue to be escalated to the appropriate billing and account resolution team and resolved properly.
Thank you.