Billing issues after transferring service

I transferred service 4 months ago to my new address ,   I am getting charged on the old address location.    I went through the Xfinity transfer to new home process and the person assisting did not open a work order to close the old account, just set up a new account.   I even had a tech come to new house to assist in set up WiFi and all tvs.     

when I found I was still being charged due to auto pay I contacted customer service.    3 1/2 hours later, a Supervisor says there was not a work order to close the old account, all

charges are valid.   Does not matter the WiFi unit cannot be in 2 locations and accounts

at the same time, or that a work order was opened to transfer the unit to a new account.   

Supervisor says to post on this forum or mail a letter to home office in Philadelphia.