Recently had oil changed. That part of service wa...

Recently had oil changed. That part of service was great! The following day, I was traveling the interstate when I heard something hit the bottom of car. Didn't think too much of it until I got off on the exit and heard the most awful noise! I was able to pull off the road and discovered a piece of the under carriage cover dragging the ground. As this was a weekend, I wasn't able to have it taken care of until Monday. Until that time, I was able to keep it taped up (sort of). When I was able to bring it in to be looked at, I was taken care of fairly quickly. I had an appointment for 2:45. I sat in the lounge until almost 5:00, when the service manager was getting ready to leave. I don't know what happened during that 2 hour time frame, but I am sure it could not have taken that long to replace a bolt.