Debt Collection Threat for $0.00 "Past Due" Bill on Inactive Accounts

Hello,

I'm hoping someone here can help me. I have been receiving multiple texts for the past month warning about being overdue for a $0.00 bill. Every time I have spoken to customer service over the phone they confirmed that I did not owe any money, and that the accounts would eventually close and the texts would stop. Today I received a text warning that I may be sent to collections.

The accounts under my name are slightly confusing, so I will give some context:

-I have one account that should be closed from the last address that I recently moved from.

-I have one account at my current address that is functioning properly and is active (as far as I am aware).

-I have one account at my current address that is not and should not be active, and is the result of a failed first attempt at getting set up (this was a whole other fiasco that I won't get into unless the details are deemed relevant).

When logging into the app, both the account from my old address and the inactive account at my current address show past due balances of $0.00.

I have not been able to get anywhere with calling customer service on the phone, so I am hopeful that someone here can help put this issue to rest. I really do not want to hassle with credit bureaus/collection agencies/Xfinity over $0.00.

Note that I am not sure which of the two problem accounts these warning texts are in relation to, since I am only getting one text at a time and both accounts show "past due".