Sorry, but nobody intercepted and changed the emails. Email doesn't work like that. Check your Tesla account. The hackers probably guessed your Tesla password, then changed your email address to do a man-in-the-middle attack. Wouldn't be surprised if they changed the email address back on your account after they scammed you, so you may see no evidence of their malfeasance.
If you're using your Tesla password on any other websites please consider those accounts to be compromised as well.
I agree that this is the most likely scenario. Another reason why we need 2FA on our Tesla accounts. I can’t believe that it’s still not an option.