Unauthorized debit order - ***** and poor service!!!

I have noticed that an unauthorized debit order of R790 has been taken off my account. The reference is: MULTI D FORAANDG ********** 16 June 2021. I see this happened before to several clients. I phoned FNB to inform them of this unauthorised debit order. They informed me that I have to dispute the debit order, which in turn will cost R325. What the heck?? Why can they not just reverse the debit order?? I honestly think it is time I found a more suitable bank My complaint is that it should not be possible for anyone to start debiting your account without written consent. It is a huge security risk. All the consultant could give me was the supposed reference number of the debtor which was Absa Bureau Services and the phone number given does not actually exist. All FNB consultants should be filled in on this so that they don't send you out looking for a company that actually doesn't exist. FNB Should put a block on this debit order.