The definition of security

I called to cancel a service I have been using for a couple of years. This is the conversation we had:

Me: Hello, I am calling to cancel my service.

Him: Yes sir, may I have your name please?

Me: Laurent Duperval.

Him: Thank you. Now, to validate that I am speaking to the correct person, can you please give me your email address?

Me: Sure. (I give him my business address)

Him: Thank you, sir. By any chance did you ever have an email which was (he spells out my personal email address).

Me: Yes, and I still use it.

Him: Excellent. Now, let's see what we can do for you...

Hmmmm..........