forced to sign legal document by mfc/nedbank pty ltd

i tried for the last 3 months to change my dt order from one bank to another bank. but they want a unknown person to myself to give authorization to move my acc. short story when you want to change your dt order at mfc a policeman or a post office official called a commissioner of auth must give authorization to do even if they don't know you . i had to let a unknown 3rd party person give mfc permission to move my dt order from one account to the other. and if you dont do that they just move the dt order. in short you are forced to force a 3rd party person to sign a legal document who does not know you at all to give them permission to move your dt order and if you say that legally that cant be right then they just say we will blacklist you. i just think to force someone to sign legal documents is ******* on its own.