Hello I applied for my Sin number twice. But the Canada service people told due to address mismatch, my application will be rejected and wait for the rejection letter and reapply. I have a valid study permit but my sin number will expire in this July. Should I wait for the rejection letter or can I reapply right away?? Because if I don’t reapply within time, my sin number will expire. My another doubt is if I reapply now itself before the rejection letter, will it consider a multiple application and reject? Is multiple application is a fraud activity?