Unable to cancel within 30 days and keep number.

I called the call centre and spoke to Mr Simon Mogalaka *** to cancel my contract and keep my number as prepaid, I was told that I need to call after my contract has expired if i require to keep my number, but in my previous call i was told I need to give 30 days notice to cancel so if i need to call after my contract end date i would be paying for an additional month. I do not understand why MTN uses these practices as all the other cellular providers will allow u to put your number on prepaid within the 30 day notice period. Why is this not the case with MTN. I have been very disappointed with this contract and MTN has just given me another reason to not stay with them. Please could someone contact me to clarify this issue as my next complaint would then be to ICASA.<br>