I AM A CLIENT OF MTN FOR YEARS BUT...

I upgraded my contract with mtn, now , the statement I couldn't understant it , so I decided to call the mtn number 808, then the number was picked by a lady , I cant remember but recording number ***, the agent advised me that I will pay R357, I asked if there are no exra charges, she confirmed that there is no extra to that amount, and come month end I paid over a thousand, I decided to give a call again , and talked to a lady called uyanda, recording ***, and month end I paid over R1000 again. now I called and asked my refund and I talked to one other agent who was rough who cut my call, and called again and talked to Nohle, ***, and asked to talk to the manager, now one evening the one who said is standing in for the manager called me , and this person was very dictative, and assume an argument that I don't understand, she claims that I was not listening to her and that I was not giving her time to speak , I would with the recording listened to. I still insist, I want my refund for the month that I was told my account was meant to me R357...