Is this how MTN SA treats their customers???

MTN updated my contract without my approval:<br> They called and discussed the update but unfortunately the call was cut because of the network, eventually my contract got updated to a different version that is just unreasonable, not even what they were trying to convince me about. When I tried calling they told me that I requested an update, while I know I did no such. Now I cannot enjoy my phone as I am not able to recharge, I am only given a specific amount and if I finish it my account gets blocked, then I have to call so they unblock, and they charge me crazy amounts. I had agreed to pay R108 per month but recently I pay more than R200, sometimes even up to R300, which I do not even understand where it's coming from, and they are always threatening to sue me as if I don't even pay them.<br> When I call the call centre for help they make me stay on the line for about 30 minutes, sometimes even more, and they are always sending me up and down, everyone saying it is not their department, not assisting me with anything and end up wasting my time. All I am asking is for them to reverse this stupid update<br> I have been trying to solve this since beginning of February, until today nothing<br>