Mother Passed Away tried to cancel service on 3/3. AT&T won't cancel her Uverse, Phone, and Internet due to technical issue on their side!!

My elderly mother passed away, and on 3/3/20 I called to cancel the service for Uverse, Phone and Internet, because there's nobody remaining in the residence. Her bills were paid in full, nothing owing on the account.

Six phone calls for over three hours, supposed escalation to their 'Back Office Escalation Team' and still no resolution on 3/27! They have promised phone calls and email regarding status, and there has not been one follow-up that they stated they would do. The response is 'We don't understand, we have the back office working on it.' and they keep insisting that I call back to resolve, even though there is nothing, obviously, that I can do to resolve it by staying on hold.

I canceled the services, have an account in good standing, and AT&T wants to make a difficult time when we're grieving the loss of our mother, much more difficult by making their technical problems ours, by not canceling our services as requested.