NJClass Loans already billing me?

I have taken a semester leave during late February from school and will be returning in the fall. I have also taken my "exit counseling interview" which was required by the financial aid office/loan company apon leaving. I have just gotten a letter in the mail stating that I have been 20 days past due my NJclass loan payment for the month and if 30 days past due, will be reported towards my credit. Why am I being billed if I have not been out of school for 6 months and have not dropped school? Whats worse is I cannot get a hold of these people on the phone or email so having my credit on the line is pretty serious when I cannot get any help or any answers. According to the NJClass Loan website, their loans work just like any other loan...monthly repayment is 6 months after a student leaves/exits school.