FNB just take money out of my account

Good day my name is Ewald Erasmus I'd nr ***, I've got 2 fnb loans and it's hand over to the attorneys so they phoned in the beginning of the month so I made arrangements with them to pay them the end of the month, now FNB take money out off my account, I mean they took my last money now, I can't pay FNB and the attorneys the end of the mont, I phoned FNB to refuse the money all what they said they can't, so what must I do, my contack number is ***