Changed contract for wrong reasons

So, my mother is like many others not very smart when it comes to phones and how it works, Yet Vodacoms sly damn agents phoned her and changed her contract to something that she DOES NOT NEED at all AND that is more expensive and cuts her off??? And this guy promised her no extra costs and/or changes, well what do you know? It changed!

I use to work for Vodacom and had to deal with this **** every single day, but now that it happened to me its even worse. I tried to do the nice thing and change it in a Vodacom store, but now there is a excess payment of R800 and no one can override it?

Utter **** service, honestly.