If you have not received satisfactory results working with your student loan servicer resolving a dispute you may contact FSA Ombudsman Group at fsaombudsmanoffice@ed.gov or 1-877-557-2575 for assistance.
For example if, due to the current problem with GradPlus, you had to make a payment or your account was debited by your student loan servicer without authorization while you were in school, the Ombudsman’s office should be able to assist you in retrieving your payment or clearing up discrepancies with your student loan servicer.