MTN LOVES TO TAKE WHATEVER AMOUNT THEY FEEL LIKE FOR THE MONTH

I had two contracts which i wanted to cancel. So i phoned in and the guy told me the balance to be paid on each is R1987 . So i sell the phones and then paid the balance on the one contract so long and then phoned back to cancel the contract. They then proceed to tell me that they made a calculation error ! They then tell me i needs to pay them R5000 per contract which is obsurd as that is not what my calculations came out to ...... in the meanwhile of all this i took out another contract with them. Long story short i have two contract now and the premuim is R570 per month . Everymonth i have to phone my bank to do a reversal on my debit order as mtn does not rectify my acc errors with them , they just take R1115 from my account or whatever balance they like ! I have never ever skipped a payment with them and then their untrained rude staff wants to tell me i owe them even if i never skipped a payment etc. This is damaging my credit worthiness and if it needs to i will take this further im sick and tired of this service as there is no service with mtn . Most of the time the service is unavailable or suspended .