The Magnificent Nine : A bill I do not have to pay

Hello I recently closed my account for the service address for [Edited: "Personal Information"]. However I just got a bill that is 213$ for that address, could you clarify.
I closed my account effective July 31st. And I paid my last bill of 75$ on July 15th for the month of July. When i called xfinity i had no charges due. And nothing left. I closed the account effective July 31st. I have been told I have 14days to return my modem which my friend will do next week for this address. One of your agents told me its an advanced bill that i will get refunded for, one agent told me I didnt pay my July and August bill? When i canceled my bill effective 31st July. Eight of your agents cancled and walked off from the issue.
I have had several phone calls with xfinity agents that clarified all my bills were paid and only thing that was left to do was return my modem which will be done by next week. I spoke to two xfinity agents here in Maryland too who clarified everything was sorted in my [Edited: "Personal Information"].


All im tryna get is some normal help, with a sensible human representative that can give me a clear answer to why I am being charged this amount, istead of people just swapping up on me. on this live chat as if its tinder.
Ive never had such issues with xifinity before but its weird cz if I click the link to "Make Payment" on the link sent to  my email for the [Edited: "Personal Information"] address it relinks me to my current address with only 50$ due. So not sure whats going on.

Also I seriously need to report yall's live chat. Was the morst garbage experience I have had in a while. Although a little fun. 

The agents names are , Luv (Sanjana) , Jayesh, Lovely, Niranjan, Sanjana, Utkarsh, Paradarami, Arshad and Mike. 
The Magnificent Nine. 
I thought I was being introduced to the avengers. 


*UPDATE: was told by latest agent that the payment was actually made on the 15th of July but was not updated on your end (xfinity) and which is why I am being charged an "overdue" amount. Actually ridiculous and I can see why all the rest of the agents dipped. Probably too lazy to deal with the issue.

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