********* call center agent and manager

On July 7, I was contacted by an agent named Ashen from the Rewards Group,(MOndo Mobile) a registered Vodacom agent. i was offered an upgrade of my existing contract to include an extra 2GB of Data. i was informed that the data would be loaded onto my exiting contract. I accepted the offer as I expressly asked that it be loaded onto my existing contract. Later that evening i received a notification SMS that an extra line had been allocated and activated on my contract. upon enquiring on the vodacom helpline, i was informed that an extra line had been added. <br> I tried to cancel the contract as i was told that i have seven days withing which to do so. i called the vodacom cancellations line *** and was told to contact \The Rewards Group"directly on *** or *** the landline number rings and an automated voice message comes on and the call gets cut after 1 minute. the sharecall number rings once and cuts the call. I need this contract cancelled immediately as it was not what was promised to me. How do i cancel this contract if i cannot phone them? I need Vodacom to step in before any billing takes place and i am stuck with a contract i do not need. no ans on 13/07/2015! """