Unacceptable service

This is the second time that I am complaining about the extremely bad service that I am receiving. More than a month ago I wanted to make changes to my voice bundle. I was never done so i cancelled it bcos i was not informed that it will cost an additional R2,000 to make the change due to the fact that I'm still in my contract period. I also cancelled the additional data bundle that i was offered **********ly ( i was told that the 5G will REPLACE my current 10G) and that i will get a 75% discount. This 5G was in fact added to my 10G, which I do not need. After my last review I was called by Vodacom who promised that it would be cancelled at the end of last month! I now see on the app that it was never cancelled and that I will pay for it again at the end of June!!!! What must I do to get Vodacom to do what they promise? It is so frustrating