Someone I know had applied for student visa and got visa approval decision a week later college start date and unfortunately college cancelled his admission. He applied in same college a year later and got admission and he applied for student visa and surprisingly,visa got rejected.since he has previous valid visa approval stamp till 2019, He travelled to Canada and got student permit and entry based on previous visa stamp. Is it illegal to enter in Canada based on old stamp ? Wouldn’t he have issue when he apply for permanent residency?? Thanks