Unauthorised debit orders and charges

So Nedbank always has some funny charges right, as if that is not enough I get an sms notification that 4 debit orders went through my account which I know had less money than they debited. As soon as I noticed that it is those stupid unauthorised debit orders I logged in to reverse the money (Ref no: ********** 1 and F ********** 1) there was no reply and to my shock I wake and see 4 R150 unpaid fees from Nedbank this is after I clearly told them I do not know who those people are and to reverse their debit orders. This is so unfair imagine R600 gone as if we do not have enough expenses already, and who in their right mind will allow a debit to off on the day that they know they is no money, the next thing they will say you have bad credit but they fail to protect my money from ********** who all the time take our money. No feedback from Nedbank but can I please have my money back