Bounced around cancelling my contract

I took out a contract with Vodacom/Mondo Mobile on the 8th April 2016. The consultant assured me that this contract was an extension to my current contract, however this was not the case. Subsequently, I called to cancel this contract within 7 days. The device was collected and i do not have this device anymore. I have been jumping around between Vodacom and Mondo mobile to cancel this contract and no one can seem to cancel this contract because they keep jumping back and forth between each other. It seems that when Vodacom wants to sell you something it is very easy to open, but to close a contract is a nightmare!!!! Consultants dealt with - Corelle Naidoo and Lazerene Singh.