cancellation

I am extremely angry with the type of service received from mtn after being a loyal client of 8 years! I called into your call centre in January (retension dep) requesting cancellation. I was advised that the end date of my contract is 10 Feb and that cancellation was processed. I was also informed that if i wish to keep my number on prepaid that i should call in on 11 Feb and my number will then be placed on prepaid. Now i asked da lady several times if the cancellation was put through and she advises "yes"....i even called back to the call centre towards the end of Jan to confirm when the last deduction will go off and was informed that it will be on the end of Feb.....can you imagine the shock i got when i just called them now to place my nr on prepaid!!... Firstly i was told to call back tomorrow as the retension dep is closed...wen i told dem i dnt want to cancel as cancellation was already done, i simply want to place my nr on prepaid....i was now told that my contract was never cancel!!!!???????.....i am going on maternity leave and will not be able to pay another month as i made sure to cancel the contract when i was suppose to!.... Oh n then i was advised to call back tomorrow to cancel and that i will still receive my data n minutes this month n be billed for it again!!!!!HELL NoOoooo!!!!! Worse service received from your network ever!!!!!