Malpractice Behavior: Unauthorized Add-ons + Overbilling + Data Leak

Vodacom has been billing my account with services that I did not authorize which I have been trying to rectify for the past couple of months! I have spoken to so many call centre agents from the accounts department to cancellations yet no one can seem to fix my issue. In October 2020 I tried cancelling my account and changing networks but they insisted on retaining me due to the years of service. They told me to call in on Black Friday so that they can offer me an extremely good deal which they did and I accepted on the condition that the price proposed will be the amount I will be billed monthly and not a penny more - he confirmed and as suspected this was not the case! Vodacom has overbilled me and added services that I did not approve of. I called in December, they said they would fix my account and they will credit the difference which they have not. They keep adding a 20gig to my account and billing me for it - they keep telling me I added it when I did not. Please someone explain to me why I would want to add an additional 20gig to my contract when I already get 20gigs from my university and there is wifi everywhere I go! Side note: When I called in asking to see the initial quote, it turns out they were sending it to someone else by the name of Deon. My details being sent to Deon? Who the hell is Deon?