Breach of contract and insufficient info

I entered into a 24-month contract with Vodacom in July 2013, which was to last until July 2015. On 7 April 2015 I received a phone call from the telesales department informing me that Vodacom is phasing out contracts such as mine before the expiry date. I, being a party to the contract, however had no choice. They offered me a tablet with no airtime, only data. I was engaged in a lunch at the time of the call. I informed the consultant that it was not convenient for me to talk and requested him to phone me back at a more convenient time. He rep**** that he could not and forced me to make a decision immediately. I agreed but did not feel convinced. The consultant neglected to inform me that the simcard of my existing telephone will not fit on the tablet, that I will have to visit a Vodashop to do a simswap at extra cost and that I will have to pay a Vodacom technician to download apps like whatsapp, etc. Had I known all these facts, I would never have agreed to the new contract. As there is no Vodacom outlet in Bothaville, I had to drive to Welkom for that purpose. I want the contract cancelled and will return the tablet, which has not been used yet.