Vodacom *******

I signed a 24 month contract with Digicape for a new phone and air time with Vodacom. As I signed 2 month before the completion of my previous contract Vodacom charged me for those 2 months which I paid. Vodacom without my knowledge or consent added 2 month to my new contract and changed my agreed contract of 24 month to 36 month. How does one stop the *****ulent monsters when they cant be bothered to even answer ones calls...Its similar to buying airtime and then taking it away if you dont use it in 30 days...what BULL**** is that. I bought a product or service therefore I dam not in debt to You...CUSTOMER SERVICE what a joke this company is ********.