Frustration with ABSA PRIVATE BANK bad service

My husband and I have been clients with ABSA for over 20 years. I took time to register for voice authentication to ensure security on our accounts and to make communication faster with the people at Private Bank asking security questions. A few months ago, I phoned Private Bank PE to reverse an unauthorized debit order which came off our account. When the lady started asking questions, I told her that I have registered for the voice authentication after which she told me that they are experiencing technical difficulty and cannot use the voice authentication. She then started asking me questions like, when did I buy my first car and which model and make was it, what was my first dog's name and other ridiculous questions...... At the end, I did not pass the test because I couldn't remember what car I bought in 1983 and I was blocked!!! I was fuming because I just wanted the debit order reversed!! Our "personal banker"! Let me not even start with that!!! I now have 4 unauthorized debit orders on my account: 1. Who do I speak to now???? 2. Why is my account not protected????