MTN Debit order deduction

Hi my name is NORAH KHUNOU ID number *** i have a big problem with MTN July this year i finished paying my 2 Contract phones April and i upgraded July i got a new phone and i was supposed to pay R280 for the new phone and R70 for the insurance in total they were supposed to deduct R350 1st month July they deducted R943.53 August they deducted R682.53 September they deducted R692.53 October they deducted R542.53 . From July after they deducted R943.53 Instead of deducting R350 i went to the store i bought the phone MTN Randburg Sanlam Centre they told me if i am not buying i can call MTN call Centre i called they told me the person who was helping me with the upgrade did not cancel the other 2 phones so i paid for 3 and was told they cancelled the other 2 contracts i finished paying.25 September they debited R682.53 i went to MTN store Randburg Sanlam Centre they told to call customer care i called they told me the person helped me previous month only cancelled 1 phone and was told they will cancel the other contract. October they debited on the 25 the amount debited R542.53 I called and they told me the same story and i believe if at MTN Randburg Sanlam centre would have helped me first time i went to MTN matter was going to be resolved long time but instead they will give you attitude but they wont help. I would like to be refunded all my money that was debited from July to October total amount of R1803.63.I Don't want to go to the bank and reverse the debit order cause they will switch off the 1 Active contract