https://www.hsbc.ca/1/2/personal/canadi ... me-advance
If you were unable to get an appointment and still really want to get this promotion, my advice would be to go into the branch and explain that you weren't able to get an appointment in time, because the branch was full.
Maybe they'll be able to do something for you? No guarantees, but for the amount of money this offer is worth, I'd say it's probably worth your effort to make a trip to the nearest branch.
Good luck everyone!