Nedbank unilaterally changing debit order dates!!!

So Nedbank decided to unilaterally move the December debit order to an earlier date without any trigger from me. This information was sent through an SMS. Should I not agree I would then have to send a reply to the same SMS before 10 December 2022 with a preferred date. This is not only wrong but I doubt if it is in terms of the consumer protection act. If I had not seen the SMS then a debit order would have gone ahead on the date proposed and if that order bounces it reflects badly on my credit record. This is to the protection of all people who might be affected by this.