Car was grinding/rattling--diagnosed as rear hub bearings, so were replaced...

What is your question?

Picked up vehicle, told the noise was gone all quiet...have to take it back because the rattling noise is still there. I hear it starting out most of the time, i.e., accelerate hear grinding rattling from the front. Maybe it stops at higher speeds & cant hear it?(The service place knew this but said noise was actually from the rear) Good reviews on the place but feel totally lied to right now...after $900. It's so loud I don't feel safe driving..any ideas??