How can I get my account billing and account access fixed after working with Comcast infrastructure since Sept 29?

I contacted Xfinity on Sept 29 to disconnect our TV service only.  We wanted to keep the internet, telephone, and cell phone service.  After 1 1/2 hours on the phone, I thought everything was done.  The customer service rep said that I would be billed $347.15 on October 9 since the bill is for part of September.  My new bill each month will be $111.67.  However, when I looked up my account on Oct 20, 2025 I noticed my new bill now read $518.39.  This was definitely unacceptable.  After calling and waiting for approximately 45 minutes, I got a representative (rep).  Unfortunately, Cherry could not help me and had to direct me to the disconnect department.  After waiting for quite a while,  Ron from the disconnect department came on.  He told me he couldn't do anything regarding my bill for $518.39 since the bill was already in the system.  Also not acceptable, but he kept insisting I will get a refund for the next billing cycle.  Unfortunately, the next billing cycle still had I owed another $518.39. .  He told me he gave me a refund of $347.15 for the November/December statement.  I asked to receive an email showing all of changes in which he said he sent.  He stayed on the phone but after 15 minutes I still didn't and never did receive it.  I asked him for a confirmation regarding my bill which after hesitation he gave me.  I had to leave the phone conversation since after 2 1/2 hours on the phone I had to leave for an appointment.  Also unacceptable.  My schedule is extremely busy hence the reason I could only get in touch with you all now.  I don't have 3 hours to spare each time I try to correct this error which isn't my fault.  

After hanging up with the rep, I was able to go into the local Xfinity store.  They also could not change anything in the system.  Even the basic info.  They found out that on Sept 29, when the initial request was made to stop the TV service only, that the rep never closed the order.  It is still showing as an opened order.  I can't do anything on my end.  I have been a loyal customer for decades and have always had to be on the phone for several hours, but at least things were fixed.  But this is undoubtdly the worst service I have ever had and very unacceptable.  I don't know where else to go to get this corrected.  The rep from the disconnect department could not understand why I shouldn't have been charged the $518.39.  He corrected it for the Nov/Dec statement, but that didn't correct the Oct/Nov statement.  I am still not sure if the correction was only for the month of Nov/Dec.  I am hoping this can be corrected before I will need to take this to the next level beyond your company.