Joined me on a contract without my knowledge.

Mid February I saw airtime on my phone so I called vodacom to find out where it came from and I was told it is RNCS that put me on a contract which I knew nothing about and never heard of when I enquired I was told its acting on behalf of Edgars, I was surprised because I no longer even have an account at Edgars so I called this RNCS call centre to cancel the contract which never happened till today, I called for more than 10 times with no assistance whatsoever all I have is lots of reference numbers still stuck with a contract I never requested which is against the law. When I asked these consultant to speak to their manager they refused, when I ask to be transfered to their cancellation department they still refuse claiming that cancellation is going to call me back which never happened. This is ruining my credit record especially since I never requested a contract now they refuse to cancel it and their call centre is full of rude consultants who are not willing to help. I am sick of being stuck with something I never asked for with no one willing to take responsibility for it because even these references they gave me are useless when there is no one following up on them.