VODACOM, STOP OVER CHARGING or CANCEL THE DEAL!

The monthly subscription has been increased to more than double the amount agreed to in the contract - without my consent. I have asked for proof of my consent (either somewhere in the contract or for some signed notification). I have also asked numerous times: PLEASE RECTIFY THE BILLING and continue to bill me as per the contract or OPTION 1: offer me some reasonable NEW agreement I could consider, or OPTION 2: please cancel the contract which has run out of the initial 24 month contract period (and continues on a month to month basis). This is my last attempt - I have done my utmost to get the matter resolved.