It happens a lot.
You’re supposed to drive 3 hours and then be told the car isn’t there and go home angry.
You could not show up after texting, calling, chatting, or emailing and say if you do not hear from them to confirm, that you will not be there. Piss them off for once, maybe.
But I bet you don’t have the wherewithal to wait an extra day or two for your Tesla.