MTN Customer Care

I acknowledge that I did not contact MTN before the end of my contact, neither did they attempt to call me but only sent an invoice. Ive been to them and loyal and never their missed a payment since the inception of my contract. They put me on a month to month contract which increased from R209 to R1145 which I feel it's a rip-off, an increase off 448% is ridiculous. Their consultants keep you waiting for a long and hang up calls when you challenge them, some even transfer you to wrong departments. I deserve answers and a 50% refund. Otherwise I am taking this matter to consumer rights.