I just received a call from this number as well - asking if I'd like to participate in a paid survey regarding my National Student Loan. Didn't ask anything specifically pertaining to me - name, address, phone number, etc. Just confirmed that I have/had a student loan and asked if I was still in school, and was aware of their debt repayment options and have ever used them, etc. She stated she was doing marketing research on their debt repayment options and awareness.
I CALLED THIS NUMBER BECAUSE THEY WERE DOING A $50.00 PAID SURVEY FOR QUESTIONS ON TREATMENTS ON HEPATITIS C. (I DON'T HAVE HEP C, BUT HOW WOULD THEY KNOW! :-)...). SO NOTJHING TO BE SCARED IOF, THEY'RE JUST A DATA COLLECTION COMPANY.