As another colleague noted, it is very common for colleges to place a hold on a student's ability to register for classes when the student has outstanding debt owed to the school. In addition, it's been my experience that the school generally places the onus on the student to stay informed of their financial obligations to the school.
That having been said, you might consider speaking with the Bursar's Office to see if there are any options that may help you here. For instance, some colleges offer emergency loans to cover these expenses, though these loans generally have a pretty short repayment term. There may be other student aid options - federal loans, PLUS loans, grants, etc. - to help bridge the financial gap and keep you in school.
Best of luck!
Nothing in this is answer should be construed as legal advice. Neither the answer, nor its particular contents, is intended to create an attorney-client relationship between the person asking the question and Andrew R. Stubblefield or Coats | Rose, PC. The person asking the question should contact a licensed attorney in their area and solicit actual legal advice based upon the particular facts and circumstances underlying their issue.