Second Opinion
When something goes wrong with your car, it can be wise to get a second opinion. After all, you want to ensure the person working on your car is a professional, and that you are being charged fairly for all labor and car parts that are necessary to remedy the problem.
If you get a second opinion because you feel you have been deeply wronged or cheated, then more power to you. Go forth and get the service you deserve. But if you make a stink about getting a second opinion- you might consider covering your basic car basics before you embarrass yourself.