Damn sucks to hear about your experience, this is very similar to what I had read in the threads throughout the years about YT Canada when I was shopping for a new bike recently.
I was on the fence between YT and Commencal and ultimately went with Commencal even though both companies had the model/size I wanted in stock and ready to ship with fear of having an experience similar to yours with YT.
Not to bash on YT - there's no doubt they make amazing bikes for the price but they seem to still have inconsistent customer service which is troubling considering you're not going through an LBS.
With regards to my experience with Commencal - they always picked up the phone when I called, were super cool and helpful with all my questions, their email response was always within a few hours - 1 day. When I ordered the meta am 4.2 from them this month it was shipped within 24 hours of ordering and I received it the day after it shipped - a total of 3 days from ordering to my doorstep. I was blown away to say the least (although I should note I do live in Vancouver and their warehouse is just nearby in Squamish)
Hope YT pulls through and you get your bike! All this hassle will go away once you hit the trails for the first time on it :)