Probably not the best idea to give people advice that specifically goes against the information thats in the order agreement. Someone is free to attempt to push off delivery, tesla is free to only allow that for a specific amount of days that are spelled out in the order agreement.
They can re assign your vehicle if you can not take delivery in the time frame they specify (which is 3 days), and if you do not take delivery within 14 days of a first attempt they can cancel you order and keep the $250. What they "should" do is not the same thing as what they "can" do. I am not entering into any discussion at all on "whats right" or "tesla cant" or whatever. I am just spelling out what is in the actual document people agree to when they order the car:
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