Early unauthorised debit order.

I have been having a bond with Nedbank since 2016 and NEVER skipped a payment. My debit order date is the 25th of each month. To my suprise on 14 August 2025, I receive an sms that my debit date will be adjusted to 22 August 2025 because of early pay date. At this point I am confused because 25th of August 2025 is on a Monday and my salary is due then. I then follow the option and respond "opt out". To my suprise, I woke up this morning to a debit order that went through my account. I called Nedbank to understand how this happened, I was informed that there is nothing they can do to reverse the money because the team who does that is only back on Monday. This left me in a very awkard position as I needed to use that money for business purposes which I now cannot and losing out on profit. When I asked about how this will work going forward, the response was they dont know. I am very very disappointed in Nedbank.