Dishonest service providers

I would like to cancel my business wireless connection, without bring charged a cancelation fee. For the he reasons below: 1. I was charged an amount that I do not know, after being told I would get a month free which did not happen. 2. My connection has not been working for a week plus when I called I told to contact my sales person. I therefore do not see the why I should continue with a contract whereas vodacom is not holding their end of the contract. I will not be paying for something that does not work. This is not acceptable and your company is taking advantage of its customers.