I must be in a twilight zone

This is a warning to everyone that may be still considering getting a Cell C contract. I got a Cell C router last month and was told that I would be paying about R400. I just got a message that Cell C has debited my account with R2400. When I called them I was told that I have now got \an open line"which I never asked for but instead the guy who sold me this thing over the phone said once my data ran out I could call and ask for more data. I was not told that I am out of data or that I would be now charged a ridiculous fee for the data. I have tied to view my statement but it requires me to have some kind of program to view it (so much fir transparency). More than anything else I would like to get out of this contract"