Who called from 4153430007

Didn't want to give their full name, first name was Nick.
When asked how they got the number their are calling, they mentioned a coworker named bob, but didn't know his last name.
Who will want to talk to a recruiter calling at your office?
Waste of time.

Really rude recruiter whose tone changed once they found out I had hiring ability. I would never hire anyone represented by them.