Sorry for the problem, Crappy. I have several suggestions:
1. Don't take your car to a department store for maintenance. I suspect that you've already figured that out.
2. File a grievance with the local BBB.
3. Find a local TV or radio news department that does consumer protection stories and tell them about it.
4. Write a letter to the CEO of Sears describing the issue and how disappointed you are. Mention that won't shop at Sears again and that you'll tell everybody you know about the problem and recommend they don't either.
5. As a final resort, file in Small Claims Court.