Have you checked the available dates over the other consulates ? Maybe you can double check your reservation online to see if there is a typo in date.
I'm not sure about the changes in Vancouver. If this is what you see from the confirmation letter, probably it's different now. If you think 3 days is too long to wait, maybe you can check the other consulates to see if they have changed the policy. I don't have the info you need at this time. By the way, Vancouver is a good city for touring why don't you consider that. You have had successful experience in Canada before should be no problem this time.
I'm not sure about the changes in Vancouver. If this is what you see from the confirmation letter, probably it's different now. If you think 3 days is too long to wait, maybe you can check the other consulates to see if they have changed the policy. I don't have the info you need at this time. By the way, Vancouver is a good city for touring why don't you consider that. You have had successful experience in Canada before should be no problem this time.