Vodacom ***** response or lack of it

A few weeks ago I wrote a review complaining about a cellphone that was taken out **********ly on my account. To this day I have received no response from Vodacom I am about to be billed over R2000 for an item that I never bought from a contract that was under R 300 which was upgraded On a contract that I was not advised had been paid in full and was converted to being billed monthly. Th phone is still active and being used, My credit is about to be affected I really just want to know what options I have to that I can hold Vodacom responsible, I am so angry at this point I want to cry.