ABSA Can't Stop Unauthorised Deductions

My ABSA cheque account is under siege from bogus companies withdrawing money from my account as they wish. For the past 4 months, monthly deductions of R500 have been made from my account by RNR DIRECT, SS DIRECT, DDS DYNAMIC, SSM DBN, LUKSHA AND TLG. ALL WITHDRAWING R99,00 each plus 15,50 of charges per transaction. I appoached ABSA and they claim not to be able to help. It looks like I don't have a say on my own account. My useless bank can't protect me. It looks like a perfect time to change banks despite the fact that I have been with them since the days of Trustbank.