This is just awful, I have no other words. Oh yes: disgusting. That should never happen, and yet, this is what I often hear from whoever has dealt with Tesla's service. It is so sad.
If I had your same experience, I would have probably destroyed the service center unless someone would have listened to me. That's utterly unacceptable.
I think you should get back and ask to talk to the manager of the service center. Report what happened and say that's unacceptable. Also, tell him that your concern is real and cannot be dismissed. Hundreds of other people are complaining about it, you are not alone. Also, ask to compare your car with a different one, possibly an older one, which will be most probably completely quiet. At that point, how can they still dismiss the problem? And if you are unable to find a quiet Model 3 for whatever reason (maybe they have just noisy ones??), ask to compare it with a Model Y, a Model S or even a Model X. Do they have the same noise inside???!! I am sure they don't.
Of course, I have no idea if our petition is going to make any difference, but at least, we'll try. I am also wondering if there is any "legal" way to prevent all this from happening. We are their customers. We paid a lot of money for these cars, and yet, we have no assistance when we ask for it. And not only that but we are also mistrated and derided! Any lawyers listening here? And, possibly, advising us on all this?
Thank you so much for reporting your experience.