Disappointing service

I posted here on 30 October to find out why my data contract was being cancelled as I had not authorised it. A lady from Vodacom called me to tell me that they are investigating it but failed to give me any further feedback. I then called in on 31 October to LEGITIMATELY cancel my contract and the lady confirmed it will be done. Yet the contract is still active to date and I am going to be billed for it. So let me understand - someone cancels my contract without my consent and it’s done right away but when I actually call in to cancel, it is not done?? At this point I have lost all faith in Vodacom and am considering taking my family’s contracts elsewhere. I want my data contract cancelled AND I need feedback regarding why my instruction was not followed when I called in on the 31st of October.