Contract Cancelation

I have cancelled a contract with Vodacom 3 years ago but it is still on my name and i have send emails to them to cancel the contract from the Vodacom store in Cape Gate and still it not cancelled i am paying for more than three years for something i don`t use. I want that number canlled and they need to refund me for the three years. Vodacom can get in touch with me my email adress is ***