Tesla Software Developer interview questions

I got interviewed by two engineers one was an MIT undergrad and other was an MIT Ph.d, they asked me questions from control theory to machine learning to electric circuit to mechanics. It was super broad and in detail, needless to say I had a very difficult time. Maybe I didn't make it clear to them that I was mainly a software engineer.

This was without a doubt, the worst interview process I've ever gone through. I first applied through a recruiter, and after looking at my resume told me that he'd like to set up a time to speak on the phone. A day later, instead of calling me, he sent me an email that the team thought my background and experience were perfect for the role. So he just sent me a coding challenge to do. This was a 4-hour open ended challenge. After submitting it, I did not hear anything for a week. I emailed, then emailed again a few days later. After 2 WEEKS, they email me back. In this email, they never once reference the challenge I did. In fact, all they say is that my "background" is not fit for the role. Basically, I was strung along and I don't think they even read over the challenge that took me 4 hours to complete.