Vodacom bad billing

I took out 2 upgraded contracts a year ago. Vodacom put me on the smart s contract instead of the u choose 150. I have sent several emails and called however i get moved from pillar to post. I am being billed for services that i did not request for a year and I'd like to get this sorted as I am a dedicated vodacom customer amd would not like to be forced away from your other good services