Vodacom- contract cancellation ****

I Have been calling Vodacom endlessly to reverse charges and cancel my contract. after placing the notice for cancellation in February, for contracts(two) to end in March and be switched to prepaid, only one was ended. the other is continuing to bill. Vodacom call centres(outsourced **** centres, that seem to be billing Vodacom by calls taken and duration) can never assist. each time i call, they make me go over the entire history of the problem again, should this not have been logged on the system already? these call centres never escalate any issues or provide reference numbers. they always cut the call as an alternative to providing reference number or escalation. in February I had to argue with the consultant to place notice for cancellation, they said that I could only place notice on the 28 feb 2025, after some argument and convincing, they were able to place the notice. I feel that this bully tactic from Vodacom is just to get extra premiums out of loyal customers.