I truly do not want to be perceived as being flippant. I also fully understand your frustration.
However, I would strongly suggest hiring your own middle-man to handle this process. Yes, it will cost more money, but my time and my level of frustration has a price tag as well. I use Safari Specialty Importers. They are US based, so I have no idea if they are available to help you. But someone in Canada fills the same business model.
There are things that we simply do not do as well as people who do it every day. Often - even typically - with this sort of thing they have relationships with the key members of the bureaucracy at every port of entry. That too has a value. Figure it into the budget and hire them to run this sort of obstacle course.
Really hope you get it sorted out.
