I keep getting calls regarding an account I don't own

I have not been a customer of Xfinity for over 1.5 years, but almost weekly I repeatedly get phone calls from Xfinity claiming that I am past due on my account. When I call back Xfinity, the number of the phone I use is associated with the said account in their system, but the mentioned address is not my address. In addition, if Xfinity sends me a text message (for example, to enter an automated payment portal), It is sent to a number that is 1 digit different than my phone number. It seems like the system they use to send text messages goes to the correct owner of the account, but for some reason, whatever system is used for phone calls, has my number associated with it.

However, I may be worried that I could be a victim of Identity theft...

I've called Xfinity but they have told me they cant do anything about it since my name doesn't match the account holders name. This is unacceptable. Considering that Xfinity has been the victim of a recent hack, and they refuse to do anything to disassociate my number with whoever's account it is, I will be exploring legal actions if this is not fixed.