It's unfortunate, but does not come as a surprise. I am a member of the BC Airstream club, and comments similar to yours are widespread among everyone. I was at the Bozeman International Rally, and spoke directly to Larry Huttle about the lack of support and service in Western Canada.
There's a lot of knowledge and experience in the local BC club, and we know of RV service shops that are good depending on the service needed. One particular place in the Vancouver area have people from a former Airstream dealer years ago, and they may still do service work - I can check with folks that just got a new unit a couple of years ago and have gone to him for service in the past. They will not be able to warranty work though.
The nearest dealer is Airstream of Spokane, and they are excellent. If it involves warranty work, they may be able to help you.
5418 - VAC Past President 2015-16
BC Unit Past President 2009-10