CANCELLED CONTRACT, YET UPGRADED?

On the 22 July 2015 I received a call from a Vishen from MTN to discover later on he was actually from an outsourced company working for MTN called Velociti. He advised I was due for upgrade. I advised I am not yet at 2yrs of contract. He said system showing I am. Asked to check with Manager and see if this can be done. He reverted that can go ahead. At the time I was not properly advised on handset and what he was selling me? I requested all we discussed be emailed to me first which he failed to do. In a panic I called MTN the next morning and queried. I requested cancellation from a Nicole. I also called Velociti and requested same with a Sumaya. Which is a day after the call mind you i.e. way before 7 day cancellation right. Despite all this MTN very \quickly"renewed this contract and cut off my current services which I have already paid for in addition did not supply the phone at the time. I have since been speaking to a Nicolette who assured me previous services will be restored within 24 - 48 hours but it uis now 3 days and nothing done. She now refuses to reply to emails and answer calls? I am also receiving tax invoices for previous contract"