Termination of Contract Not Captured.

I hate to go through this every year with Telkom, when I finally thought I am done with them they come back and mess me up. My mobile Contract expired in April and i was told that if i dont want to upgrade the contract i should file for cancellation a month before expiry and I did file in March and the call center agent told me once they received an email they will cancel and send me a ref no. To this day i have not received any feedback and i am being charged on Month to month, Sandra Mnisi (S) ********** and Sithabiso Hlongwane (SH) ********** are the agents i communicated with regarding the cancellation and they have failed to cancel it.