OVERCHARGED FOR TWO CONTRACTS

I'm very disappointed with Vodacom's service. In July 2020 I was called for a contract upgrade of which I accepted. That's when my trouble with them began. Firstly from then until I was charged for 2 contracts R615 the old one R299 and the new one R299, when I called to query this I was told my old contract only expires at the end of October, which I thought was hogwash however I accepted that ****py story from them. Then in November I called them again to check if my contract was cancelled they said NO it was not. So I asked them to cancel my contract then they convinced me to take another contract for R70. Meaning from the 20th November I was supposed to be charged R369, however guess what I'm still being charged R637 when I call to query this I'm taken from pillar to post without any joy. Now I want to cancel everything I'm fed up with them