Are you sure the dealer understands the noise to which you're referring?
Have you or they been able to reproduce the noise while it was in the
service department?

These things are critical to making a proper diagnosis. If you're unsure
as to whether they occurred, then you'll need to return and ask for
someone to listen to the noise in your presence so you can point it out to
them.

If they did in fact hear the noise and repair all the items that they said
were necessary to repair the noise, then I think it's time to return and
ask for them to fix the car for free or credit you for the money you've
already spent.