Unauthorised debit orders

I will be cancelling my cheque account with ABSA. Every month I am charged crazy amounts for "unauthorized debit orders". On top of that, my normal fee of about R100 for my cheque account grows monthly. This month I was debited close to R700 from them. (and that is just one debit order. I haven't even checked my statement for any other debit orders). The details just say to "check detailed statement". Do you know what my detailed statement says? Nothing. No explanation. This is NOT what I signed up for. I was told all the little fees etc, including things like declined payments, would all be covered under my cheque account monthly fee of R100. I was **** to and am being ****** from. And I will not accept this any longer. My account is in arrears every month BECAUSE of Absa. And then they take off more because I am in arrears. RIDICULOUS!!!!!!!