Vodacom contract cancellation

Cancellation a Vodacom contract -mission impossible! I want to express my dissatisfaction regarding the cancellation of my Vodacom contracts. I am struggling for more than a month to get proper communication of the cancellation of my contract or the cancelt sms promised. You may call the *** number till you are blue in the face, there is no response only a loop flow. I visited the Vodacom store today, and they just shrugged their shoulders and said they do not have the “authority” to cancel contracts. How on earth is this legal? Especially if the contract reached expiry months ago already?