Deducting thousands without ANY Arrangement

This the 2nd time I open a Nedbank Account. And the 2nd time they deduct thousands of rands with arranging with me if its ok. R1700 deducted is not a joke. And now I cannot get myself to work. This unnacceptable and the Ombudsman is going hear about this. If a simple call was made to me, I could've budgeted for specific amount and date. But they just deduct. Now I'm going to get fired because I cannot get to work this entire month, what a way to lose business.