Can a college charge you for a grant?

I recieved a $800 grant and never used it my first semester then got a check back for it the next semester, went all throughout using the check to pay off what was left of the tuition bill then the college said i owed them the money back for the check as a glitch had not accounted for the check. Ive had multiple... show more I recieved a $800 grant and never used it my first semester then got a check back for it the next semester, went all throughout using the check to pay off what was left of the tuition bill then the college said i owed them the money back for the check as a glitch had not accounted for the check. Ive had multiple issues with this school along with them saying that im not allowed to drop classes or even drop the school so are they allowed to hold this $800 bill over my head?
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