Delivery center?
As far as I can figure out, the SA are just for info pre-sale. Unlike almost every other car dealership, they do not give discounts, nor do they make commission. It seems like, Tesla has decided that once you have placed your order, there is no more information required, until your car is ready for delivery, and then the DC takes over. For most of the people waiting, it sounds like a memo was sent out to "under promise" so most SA's say the car will either "be delivered the last 2 weeks of the year" or "before the end of the year."
It is different, and when they are not transparent on their delivery times, it can be stressful/annoying.
Before my order was placed, I would get replies within an hour to my silly emails. Since my order was placed, I have received 3 emails from Tesla SA's all "friendly reminder"ing me to fill out the online forms I have already filled out. I have replied to each of them asking for clarification/verification of what needs to be completed, and have never received a reply to any of them.