Well it seems that there is a ID Theft out there!
Make note of this. NEVER give your information to anyone who calls you as a recruiter. And never ever give your SSN to anyone that's not standing in front of you in that school and has been vetted by the school.!
If you did NOT make the call yourself to a number given by a legitimate source just forget it! The don't need any information at all!
if it's a Craigs List listing then be very careful with what you divulge!