I almost fell for this

I received this email from "Bank of America" and it looked so real. I called up the number listed in the email. I hang up after the greeting. Why?
It asked for my full social security number aka NRIC number. Now i'm very sure Bank of America never ask for this. In fact, i have registered my hp with them, and the last time i called in to Bank of America, they had all my info when i called in with the hp that was registered with them.

To think that i almost fell for this and become a victim of identity theft. To think that they even have the same greetings as the real Bank of America when u call in