Call centre consultant lies about changing Banking details on system

On the 4th of Aug 2017 I made a call to Nedbank notifying them about changing my banking details. damn woman named Patricia assured me that she's made changes on the system, come pay day, debit order bounces because the stupid woman **** and did not change my banking details. Now i'm 'arrears' when i ask to speak to her manager they tell me all the managers are in a meeting. This is highly unacceptable! I've been holding the line for long without any answers whatsoever! The disrespect! sies