Disgusting sales tactic

Beyond frustrating experience. Won't ever recommend to anyone. They asked to increase my data usage since they noticed we run out early in the month. I confirmed and said to them if they do this won't it be charged to my monthly bill and they said it won't. It will remain the same. I said how is this possible and they said this is something they are doing for their customers. Months later I am still trying to cancel because lo and behold my monthly billing has increased by R200. I want my money back and I will be taking vodacom to the ombudsman as I have proof in the form of their recordings of what I am speaking of. I WANT MY MONEY BACK and I can't wait for my contract to end so that I can be done with vodacom.