Vodacom upgrades my account without my authorization

There wasn't an option for ZERO stars unfortunately as that is how I'd rate the absolute lack of service received from Vodacom. I have been trying to cancel my contract for going on 4 months. Reason being that someone in the Upgrades department upgraded my account, without my authorization and I have been waiting, not so patiently for a call from Vodacom, after a supposed investigation into the upgrade has been done, so that I can finally cancel my contract without penalties, and hopefully receive a credit for the past few months of paying a contract that I do not want or need any longer. Shockingly, a Vodacom staff member at the store in V&A Waterfront, told me that the call centre makes it very difficult for customers to cancel their accounts. I have informed Vodacom of my mobile number to contact me, which is with another network, and apparently all calls are recorded and my details are saved on their system, but still no contact from Vodacom.