Absa not protecting clients

I had 2 debicheck go off my account last month both unauthorized when I tried to reverse the money Absa told me they cant reverse. When I try to stop the debi check Absa tells me they cant stop it so what must happen now? Anyone can come and do debi checks on our accounts without approval and have your bank not being helpful? I am highly disappointed and dont feel like my money is safe with Absa anymore:(