Un-authorised Debit order

A divorce, and the ex not honouring her side , left me caching up some outstanding accounts, I have scheduled a recurring payment on my bank profile, however Nedbank feel it necessary to ignore that and without any permission debit my bank account on the 13th, is this what banks do now just what they want when they want? can see where this country is going, forget individual right in this supposed to be communist & Gestapo, I mean democratic society.