There's a long running thread about IL's for Montreal for CR1 applicants, that's where I found when the last batch of IL's were sent out. If you were only DQ'ed on 15th Feb then I'm not surprised you've not received an IL yet, even with an expedite. Montreal probably haven't even got your file yet, what does your status say on CEAC?
Just to confirm, you have received the expedite from the consulate? Not from NVC?