Unauthorised debit order

I have been a Capitec customer for years as I love banking with them but recently they have disappointed me by authorising a debit order in my account without confirming with me if I know of such debit,now my money was debited from my account and when I dispute or stop the debit their system says the debit can't be stopped or disputed but it is not an approved debit. As a bank I think it is your duty to confirm with your client any activities that goes on from their account, now money that was meant for my school is gone to some policy I never app**** for. Assist me in getting my money back.