Arrogant consultant

I phoned in to FNB to increase a limit. I understand that they have to ask 1000 questions due to security purposes however the consultant had no way of asking the questions. He was shouting at me when asking questions as if I am a child. We are they customer and its not the other way. FNB should employ people who can speak clearly and politely and who have patience. I am seriously considering to change banks after being with them for three years.