Hi, I just got my Study Visa approved last week for my Fall 2019 semester. However, I just received an offer from my dream university, so I am thinking to go with it and decline my previous choice. However, since I have already got the Study Visa with their offer, what should I do next? I have already let the previous university know that I won't go there. Should I apply for a new Study Visa with the IRCC? Or I can simply call them and change the vise?