Mtn rewards department is *****

I am currently on an Mtn plan where I am paying R269 for data and minutes. On the 13th of August I received a call from a consultant Nomfundo Myeni calling from the Rewards department, who said they can top up my monthly data up to 6GB by only adding R39 to what I’m currently paying and I asked her will there be any additional fees that I will pay prior to that because I’ve had a situation before where I was not told about any turn around fees and she said “No mam you will only be charged an extra R39 on your next payment” meaning the new bill will be R308. Came the 20th and I was billed R738 🤬 when I called MTN to inquire I discovered that even my monthly bill will now be R438. I called the rewards department requesting an investigation to this matter, my refund (because none of the above was agreed upon) and also the recording of that call because I was told “all calls are recorded and may be available to me upon request” funny enough I was now told that the call recording can’t be sent to me but it can only be sent to an Mtn store and it’s up to them if they will send it to me or not. I need my refund as well as the cancellation of this *****ulent service between myself and Nomfundo Myeni, call made on the 13th of August around 15:00