Unable to cancel Account falsely sold

I have a cell contact with Vodacom, a sells person phoned me in January to sell me a tablet for the amount of R150 p/m. As I do not have time to use a tablet and I asked if they can load the R150 rather on my current contract and just use the tablet as a spare at home. The lady informed me that it could be done. When we received the goods we did not use it, because I was under the impression that the R150 will be loaded on my current account. That did not happen. when I phoned to ask what is going on they said we must go in store and they will help us there. When we went to the store, they said they could not assist us because it is a different division and that we must phone in to cancel. We stood there and phoned in store the number they gave us, which did not work, you hold on forever and then the line goes off. So nothing was done and nobody even tried to help. (VODACOM RIVERSQAURE) The product was sold under false pretenses and now we have to struggle to cancel it. Really a waste of time and money and faith..