National student loans service centre po box 4030 mississauga ontario l5a 4m4 toll free within north america. Login to your nslsc account keep your loan interest free while you study let the national student loans service centre nslsc know you re still studying so that your loan repayment will be delayed until you finish and remain interest free. So the day the osap applications opened for the fall i started the process and tried to link my ouac application.