Stuck with a grossly unsuitable 24 month contract

I took out a cellphone contract 17July with Autopage based on information that I was given from Michelle. I wanted a smaller handset and was told that I could choose any of the MTN or Vodacom contracts on a list which showed the prices of those contracts depending on the choice of the phone. I was referred to their promotional booklet with what the contracts offer. I was never told that choosing the My Choice 500 with a Sony Z3 Compact would only give me 500minutes of talk time. I was led to believe that I was getting data and smses included in the price. Before activating the contract I changed my mind from a Vodacom Red Advantage to MTN My Choice 500. Sarah, who has since resigned, assisted me with this and also failed to mention that the MTN contract was only airtime. I waited over a week for my sim swop, this on the 27 July - more incompetence from their staff. I then had no messages coming through unless I was near Wifi. I assumed a problem with MTN signal. When I checked at the branch, it was discoverd that my contract didn't include data or smses. This was not my mistake. Ronald and Michelle blame Sarah but no one is fixing my problem. I am a new client and am livid!