Received a call from this number, but didn't answer it.  No message was left either.

Called and did not leave a message.

Received a call from this number.  Didn't pick up and no message left.

Picked up because I was expecting a local call.  It was "Don't hang up! This is an important message about student loans. You may be qualified for student loan forgiveness. Press 1 to see if you meet the requirements.  Ummm... yeah.  Pretty much the same as you've won $10,000!  We just need your bank account and routing information.

left no message. no caller ID.  don't know who this is.