Haynes will show you...sort of...how to get the mirror out. If the lever was pulled out of it's socket, it's easy to see and pop back into place. (I was worried about breaking the tabs off the mirror, I managed my mirror replacement without doing so.)

Another clue is: does the mirror motor make noise when you touch the control? If the motor is running, but the glass isn't, then it's more likely they did this.

I might try this myself, rather than take it to the dealer and screw around for an hour (at best), but I've done this before, and my mirror wasn't broken when I started. So maybe this isn't a good idea.

As others have said here, REALLY(!!!!), if they broke it, they should fix it!!!

As implied by another poster (presumably with dealer experience) if they broke the motor, this isn't going to help. I didn't manage to actually break my motor, just dislodge one of the arms.

Often, the service writers don't have that much understanding of how the systems work. I might suggest taking the car back and either talking to the technician or explaining (politely and calmly) to the service manager that the mirror worked fine before they replaced the glass, and could they please see if they did pull the lever out when they replaced the glass? Or if they broke the motor.

The Haynes manual is good to have, even if you don't intend to work on your car.

Good luck!

-Uncle Olaf