I contacted the Scholarships Awards Coordinator in the Faculty of Graduate Studies since there was no phone number to call on the OGS acceptance letter and she was able to decline the award for me through the OGS Program Officer. Hope you can do the same if you're still unsure of how to decline OGS
I was waitlisted and have received notice of the award today!
However, I was also awarded OGS and decided to accept it (thinking the wait-list was a shot in the dark) on June 29th. Has anyone else experienced this or know if there is a way to decline OGS after being awarded and accept SSHRC instead?