First of all you need to contact with the administration of your college and ask them the reason that why they are not refunding. Communicate with their higher management mentioning UGC guidelines. This will help you to make them understand your point and you will also know the reason behind the college response because sometimes i have seen that the college need time to refund the amount to the students. So before taking strict actions you must be aware about all the things. If still your issue persists then you can complain on UGC portal mentioning all the details. Don't worry and communicate with your college calmly.