I need help! Someone has transferred $500 from my account!
Hello.   Can I get your full name, account number and PIN please?
My name is Brian White.  I cannot remember my account number or PIN!  
No problem.  Can I get your date of birth, mother's maiden name and the name of your childhood pet to authenticate you?
Thank you!  My date of birth is 25/03/1998; my mother's maiden name is Wong; and my childhood pet was Molly.
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We will have a look at the matter ASAP and will contact you with details in due course.