Falsely charged and handed over

It is with great regret that I am probably writing this for the fourth time now , I took a contract with vodacom and my account is falsely handed over due to me not paying an amount that I am not even suppose to be paying the lady that helped me take the contract said to me I will be paying 200 and now when my bill came it's R3000 how ?? I call and ask I am being told that it's because of the airtime was I aware of that no!!! Stupid lady didn't even tell me that when i run out of airtime or minutes it will charge me !! Why because the stupid consultant just want the sale!! I called vodacom so many times and unfortunately no one is helping me I was told to pay the amount !! And that I won't do now my credit score is ruined because of these stupid people wanting sales !! So disappointed vodacom!!!!!!!!!