Request for refund still not resolved

I took out the 24 MTH MTNCHOICE 5GB @ 199 on the 14th July 2019. For the first two months, MTN was billing me for the incorrect package and I was paying the incorrect amount (Paying R300 instead of R199). After numerous attempts to resolve the issue, I was finally placed on the correct package. I have requested numerous times at MTN Longbeach mall for assistance regarding my refund for the times I was billed incorrectly, I am writing to you today as it is the 13th November and my query still hasn't been resolve.

Recently this year, there was stats about how MTN lost approximately 2 million customers. At the rate at which I'm getting service, or the lack of, I am close to joining the unhappy customers who felt MTN.