Prank, scam, or collection agency.  You did the right thing to hang up.

Possible scam?!

Young female voice.
"Hi may I speak with <MY FULL NAME>"
- yes -
"This is Crissy, and I need you to call me back tomorrow as I have some very important information for you. Will you call me back tomorrow?"
- no -
"Are you sure, it is pretty important!"
- I don't know you, goodbye.  And then I hung up.

What is this?  Anybody else ge this call?