Non authorised debit orders

Good day, I have a cheque account and a small savings account which I only keep for a few debit orders. The past few months I noticed there are unauthorised debit orders being debited from my account !!!! BOSSRWDS and IZWIZWE are being debited without any authorisation given from me ! Frist it was only the one and today 2 went through from my account. I went to Absa Vryburg last year with the same event and they stopped it, but with confirmation that they cannot guarantee for it to be debited in a later time (which just happened now). How is it possible for a bank to give away money to companies from their clients which I don't even know of ???? I will be closing this bank account next week, this is unacceptable and ***** which the bank knows of and don't do anything about it !!!!