Many years ago when I was in college I took my Jeep to a local mechanics garage to have the points replaced. I know, I know, but I didn't have any tools.
Anyway, when I called to see if it was done, it was, and they told me the bill was $120. This was back in the early 70's mind you and that was a lot of money to replace points. It seems they just went ahead and replace the fan belt and several things, "becaused it needed done." I was p*ssed! I told them I hadn't asked for that but they refused to adjust the bill. I told them I would pay the bill but that I was reporting them to the local better business bureau and the states attorney for fraud.
They refused to give me my Jeep! They said they wouldn't release it to me until the issue was resolved with the States Attorney. Given the somewhat radical times a couple of friends and I decided to picket the business. This was the times during the "Hostage Crisis" and you guessed it. One of my more clever buddies made his sign..."Jeep Held Hostage!" It only took about 10 minutes for me to get my jeep back and only paid for the points being replaced.
Not all business owners are ethical.