Misled by Mondo and No Help from MTN

I was misled by one on Mondo's consultants with regards to pricing. I had absolutely no reason to cancel within the "Cooling off period" until I received the MTN bill! Needless to say, an investigation was done by Mondo and within 48hrs it was resolved stating the recording was listened to and I was misled. I was then advised to take the item to an MTN Connect store and get an IRMS number of which I did. In the meantime, my account was debited of which I reversed the payment because I did NOT agree to pay the amount I am being charged for. ***** comes to mind. Why is it that I now have to sit with a bill I never agreed to pay?? I need answers as I feel MTN is of NO help. All they can tell me is, that I need to pay the bill. I need to pay for something that is not in my procession anymore because I returned it at MY costs. I paid R85 activation fee including travelling fares and for phone calls I need to make all the time. How is this even acceptable?? Clearly if I received an IRMS Number from the store then it means I returned the item. Why do I now need to wait for it to arrive at the warehouse and in the interim, keep paying!? Why not then debit my account for the amount I agreed to as heard on the recording and the refund that back to me whenever this ordeal is over because chances are, I'll have to fight for my own money as well.