I've been screwed by a Tesla employee as well and I can relate to OP. This is my first Tesla purchase so I asked tons of questions to a Tesla employee as i'm new to the Tesla world. Coming from over 10 years of purchasing and dealing with BMW, the experience with Tesla was amazing and I loved it until I realized I got deceived on my purchase.
I want to make note that their employees boast the constant updates on the software and such which is what I love as a tech guy. Never once do they mention that the hardware/battery/interior etc on the vehicles are always changing as well. This is something that needs to be emphasized and educated as I am sure most customers coming in are used to the basic yearly changes other manufacturers do. This is what I am accustomed to.
Confirmed my build on June 3rd. Had a delivery date set of late July/Early August. Day after confirming I get a call from my DS telling me they have an exact model that I built ready to go and I should take it so I can get my car sooner to enjoy it. I was ecstatic and asked a few more questions about it and I even jokingly asked "do you think there would be any changes from my build VS the April inventory model" since like I said above I am not use to these changes that can occur at anytime with Tesla. The DS said there would be no difference between the inventory build I would take VS the one I would be waiting for.
Picked up my 75D on June 16 and 2 weeks later, BAM, new motor/battery/whatever upgrade. Few weeks later, BAM LED and Air Suspension are now included (I wanted air suspension so bad but it wasn't even an option). I paid for the PUP specifically for the LED and adaptive feature. I could give 2 fks about the HEPA bio defense mode. Do we live in a war zone or something?
I wrote a thorough email to Tesla and after 5 days (and sending a reminder update email) they finally replied and threw me a free 3 year service plan and thanked me for being apart of the "movement". I threw it back at them and still haven't heard from them in 4 days now. I love how when I was shopping, they reply within hours when I have questions. Now that I am a customer, it takes days to get a reply. Not enjoying my post experience with Tesla at all.