My MTN is suspended because of their mistakes and I am paying my account monthly

In September (2022) last year I was called by your sales person starting to me that my number *** is due for upgrade and I was offered available deals which I chose one that I liked. After receiving my first statement after the upgrade which was mid October last year (2022), I was surprised that MTN is charging me about R15k for early contract termination and I did not request the early termination. I then called MTN to understand why are they charging me an early termination I got a feedback that they will investigate and get back to me. On their investigation they found out that the person that contacted me did a mistake and my contract was not due for upgrade then I was offered two options for paying the termination fee or return the device then my contract will be return to it original state. I then return the device in November last year (2022). But the amount of R15k is still not yet credited back into my account and my statements still state I am owing MTN that amount. Since Middle December last year (2022) my MTN service has been suspended and I am paying MTN on the monthly basis the amount that I as suppose to pay based on my contract but I am being punished with the error that they made and it seems as I am not getting any help for the past 3 months. I am now even regretting why did I choose MTN at first place and I decided to have contract for my Wife and son on MTN and we pay the service that we cannot get each month. Must I continue to pay or not as we are not getting service while paying.

Mark my words when I am done with this account I will never renew any of my contract with MTN with the way they punished me.

And I have been with MTN since 2010 in my life.

Account number: BA***