Xfinity Loyal Customer For 10 years

I love xfinity, I have been an xfinity customer for  almost 10 years. I've had your telephone, cable, security and mobile phone. Right now i am experiencing the worst service as acustomer regarding my mobile account. I got my IPhone 14 max pron in the year 2022 since then I have been charged for 2 lines $30 each now (it was higher) and I only use 1 line. For months I have been going back and forth with agents about me having to pay for 2 lines and I was only using 1 (almost 2 years later) I have been given credits on my account (which I still dont think equal to what I was charged over the course of almost 2 years). i finally called again on April 29, 2024 around 8pm central and spoke to another agent who told me that the account had been fixed going forward but previous to the issue being fixed I was still charged from the month of November 2023- April 2024 she also let me know she can only go back so far to look at the charges on my account. She then said that she got a supervisors approval to refund me $160 for that charges from Xfinity. that day i received a refund of $39.51 and nothing else. Here it is 3 weeks later and I still have not received anything else. At this point I am very frustrated and dont understand why as a loyal customer Im having to cosistantly contact Xfinity Mobile regarding incorrect charges that has been going on for almost 2 years. I'm having to explain over and over what the issue is as, if there is no notation on my account. Im just tired, dissapointed and fed up. I do not feel like Xfinity is trying to right there wrong.

Hopefully that is detailed enough