Sears Auto Center Techs Joyriding YOUR CAR!?!?

O.K. I need some help here. Has anyone taken their car or truck to a Sears Auto Center for any type of work only to find out or witness an employee of their's taking YOUR vehicle out for a "JoyRide" or "Beat-Ride"? This happened to my good friend and he's not very thrilled. I don't want to disclose many details about where and when because it's all still under investigation. I'm just doing my part in helping him with some fact finding. If anyone has any info on how to get someone within Sears upper eschelon to listen to the claim of horrible customer service, or a similar experience with a Sears Auto Center, please post here or PM me. Mods: If I posted this in the wrong spot, please feel free to move it.