Terrible Customer Service from Contact Center Agents

I have a personal loan with Nedbank. I received an SMS saying my debit order will be on the 23th of which I know there will be no money in my account. In an attempt to avoiding bouncing debit order bank charges. I called Nedbank Customer Contact Center to arrange the debit order to rather be on 26 February 2024. Zanele and other three Consultants dropped my calls without telling me anything. I do not know what is difficult in changing dates just for one month? I was thinking to change my bank account to Nedbank but with this service, I will never do it. Kind Regards, Abel