MTN CHARGES ALMOST DOUBLE MY INSTALMENT - DOES NOTHING TO RECTIFY

I took out a contract with MTN only to later realize that they trying to deduct almost DOUBLE the instalment amount each month. I have now spent months trying to contact MTN telephonically and via the 'complaints' and 'customer care' email addresses. Not a single person has contacted me and when I am able to reach someone at MTN they simply cannot assist and try to transfer me to another person who can assist. Those that can assist, never answer the transferred call. I have repeatedly spent hours of a day trying to reach MTN and amicably resolve the mistake they made with my account, only to be ignored and my complaint to be disregarded. This is extremely poor service and utter incompetence!