You probably get warnings to never, never, never, NEVER give your personal information to anyone for any reason. Well, pay attention.
My local bank, I thought, had a message for me to update my information. Since it came in a secured area and was in the message center of the bank, I figured it was important for me to update. Wrong, wrong, WRONG. The identity thieves sent over $3,000 of my money via a wire service to who knows where.
Now I'll get the money back and will go through a little grief, but my bank and the card company will be defrauded because of my moment of confusion.
Banks never, never, NEVER ask for this kind of information online or in any other way. Once an account is opened, it does not go through occasional updates. So, don't get suckered and give info to anybody online for any reason. Never, never, NEVER.