Cell C, Charging more than the contract stipulated

I had phoned Cell C yesterday 09/07/20 to make arangements to please take off a double debit at the end of the month, and not suspend my account. This was arranged and I also queried why i was being charged much more than the contract.

It turns out I was paying an extra R120 per month for Airtime that I don't every remember agreeing too? I would like this looked into urgently and backpaid to me, as this was not an agreement I made?

Then on top of it, today, I find my line suddenly suspended! Even after making arrangements yesterday. I then phoned customer care, spoke to a Sandile, who not very nicely informed me that no such arrangement could EVER be made, and when I informed him this cannot be as I have made this arrangement previously with Cell C, and had actaully done the day before, he was quite forceful in telling me no. I did not like his tone!

So I would like a more senior supervisor to look into my account and tell me why I was paying R120 per month more than my contract and why I was suspended even though an arramgenent was made. And why Sandile is not aware that this arrangement can be made?