Vodacom is such a pain. A giant Company that bullies its customers

I called Vodacom and told them that I needed to change my 3 numbers from contracts to prepaid as I had lost my job and also that I was moving out of the country. They toased me around till they called a "manager" who literally forced another contract down my throught speaking over me and saying that I should accept this new contract because I will like it and if after two weeks if I did not like it I should call them. I called them, just before the 14 days and they put me on hold. called again and they put me on hold once more called again and another lady answered and said its the last day of the period they accepted cancellation of new contracts, I explained my situation and the phone just dropped on me. Vodacom is a giant company that bullies its customers because they rely on a large customer base....they forget that the large customer base comes from customers like us. They are taking R400 from me each and every month, they give me data that I dont use they take back the data...I dont use the air time because I am outside of SA. If I dont pay them , then my name is blacklisted as a bad credit. Please help me against this golieth, anyone, please? Is there an ombudsman I could call?