Unauthorised Contract Added

I had a contract for a modem last year (+- R 130 p/m) which I cancelled on the following mobile number: ***. I have recently found out that a NEW unauthorised contract was then activated under my name without my permission / consent when I had cancelled the contract for the modem. Even a new debit order was created for R 508.99 p/m. I did not authorise Vodacom at all to upgrade my account at all, I did not consent to any new upgrade whatsoever. This new contract also comes with a handset - of which I never received, yet am paying for. Please cancel this contract and refund me all money owing from September 2014. Thank you