If any college doesn't issue NOC,so what can i do?
See every sector has corruptions. So you can get settings with the peon or something like that.
But the point is why will you do that? Getting a NOC is the right of the student and the college can't refuse for it until and unless you are ignoring any rules which you have signed in time of admission.
I hope my answer helps you. All the very best for your future endeavors!