Nedbank diducted money without my consent

Nedbank diducted an amount of R2800 on my account without informing me reference is APO MANUAL. My account number is ***. How can they do that without talking to me first. I have been trying to call Nedbank and follow this up and their consultant put me on hold for so any minutes so that my airtime can be finished. What Nedbank is doing is wrong and I will follow legal route but I'm definitely leaving the bank. The money is for a disabled child that needs to go for an operation I told that consultant and she put me on hold which is so wrong