Need Help

I lived in an apartment community Apr - Aug 2024 that had Cox Bulk accounts for internet.  I also got my own residential account for television.  I moved out July 2024, worked with cox to end my residential account.  since I was billed by apartment for internet service under bulk account, and the modem was theirs, was there prior to me moving in, I left that be.

when I moved out, I started getting calls that I had not returned the modem.  Argued to no end that the modem wasn't mine to return.  Finally, thought the apartment manager got that straightend out with their Cox Business rep.

However, some time maybe in Aug or September, I started getting billing statements from a new cox account number, not connected to my legitimate account number, for internet service at the apartment complex! The bills show my name, the address of the account, and a pin.  I talked to Cox billing, accounts, no one could do anything.  Went to a cox store TWICE, they swear they have contacted someone, because they all agree that I should not be billed as an individual for a bulk account belonging to the apartment complex.

Yesterday I received another bill from Cox saying PAST DUE.  Called the Cox store rep I had been dealing with who said "sorry,nothing more that I can do", "takes time", etc.

While I am tempted to simply pay the bill to make sure the account gets shut down, afraid to, because then will I be hounded to "return equipment" that I don't even have.  I have also sent the apartment manager a copy of the bill to see if her business rep can handle.

I am out of ideas at this point, no one seems to be able to help me, and I am so so so frustrated with Cox, I would do anything to simply drop my account if I thought it would be easy.  Hoping someone can help me