We have had horrible experiences with Hoffman grou...

We have had horrible experiences with Hoffman group auto service, especially with respect to properly diagnosing problems. This most recent visit - our Audi A4 was making noise and vibrating. They charged us an hour diagnostics fee ($145!) to say we needed new front bearings and hubs on both sides (~$2200). Brought it elsewhere for a second opinion.
Ends up that it was a broken engine mount. The bearings checked out fine. After paying half the price, car is working good as new.
Called service manager and he has yet to call me back (shocked).
Previously, they have diagnosed another vehicle as needing a serpentine belt and battery, when both had been replaced within the previous 2 months. Independent shop confirmed both were fine.
Do not trust their diagnosing skills. Always get a second opinion.
Their phone service leaves much to be desired also. Getting through to a service representative is hit or miss, and disconnections are the norm. Their voicemail messages always have a status for that date (in the office, etc.) but the date stated is always in the past. Why even reference the current date if you are not going to keep it current?