Vodacom's greed is on another level

Vodacom is seriously *****ing my moneuy. they upgraded one of my numbers without my permission in june. On 30th december, when i realised i'm paying data for a number i don't use (i took contract for a phone for a person outside of SA at the moment, data is not used), i called to cancel this number, now i'm told i will have to pay for same thing end of january because they first reversed the contract / package to original contract, when i was clear i want this number off my account and why. fortunately, i recorded the conversation. now i'm told because the reversal took vodacom 4 days, the migration or whatever terminology is used to confuse us and keep charging us for nothing, it can't be cancelled this month. we are told we need to give 30days notice to cancel but now they give us the run around. i'm thoroughly fed up,