Personally, I'd suggest calling and playing dumb (I come by it honestly). I called "because my sales guy said the appointment isn't confirmed until someone calls me, and I haven't heard from anyone and need to make pickup arrangements".
It sounds like getting through these days is like winning the lottery though.
As @9-Volt suggested, this is the best way to keep things moving! (If and only if you can manage to talk to someone before the call gets auto disconnected).
I tried calling them on my way to work and the Canadian delivery option auto hangs up and then the US delivery team is only available from Tuesday to Thursday! yay!!
Instead, I decided to call my new OA from Toronto and to my surprise she answered my call instantly. She was able to confirm that my car is indeed in Vancouver (double yay!! ) and then she gave me my delivery date and time (which is the same as my tentative date). +1000 for Cathy from Tesla Toronto .
On the side note, my trade-in had a lien on it and this took quite some time on their end to clear it out. I was told that my MVPA should be available on my Tesla account sometime tomorrow or after my delivery.