FNB debited my account earlier, without my concent

My debit order my for vehicle goes off on 26th of each month.This month FNB decides to debit my account today the 17.12.2024.I only get paid my salary for December on the 22.12.2024.I do not have any money now.please can anyone explain to me, why is FNB doing their own thing with our money.I have responsibilities .Now, I need to borrow money because I don't have enough money because FNB has debited my account on the 17th instead of the 26th.I want my money back in my account and my account can be debited on the 26th as usual.