Most child support orders do not include a college provision. If your does then you should request proof of enrollment and to see the number of hours completed after the semester is concluded.
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Without looking at your decree this is difficult to address. Please consult a Family attorney in your local area. Many attorneys, like myself, give a free initial consult and can give you clearer guidance based on all the specific facts of your case. Take all documentation with you for review by any attorney you contact, you will get a better assessment of your possible options and outcomes.
If you agreed to support through college, you may be able to arrange to pay it directly to school in form of tuition or dorm fees. A local attorney can help you come up with options.
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