Time to take the matter further

I can't believe that Cell c is billing me R289, for 2 days. I did not even touch the data that was allocated for the month of November. I think it is time to take the matter to the next level, since i have noticed that i am not taken seriously. I have NEVER missed a single payment, on 2 contracts that i had with cell c for 24 months each. Why would you want to charge me more, this is **************** and i want my money back.