I am very displeased at the service i received the...

I am very displeased at the service i received the last time I took my vehicle out to get looked at. When I picked my car back up, there were 40 extra miles on the speedometer. I know this because on the receipt they gave me, it showed almost 40 miles less than what my speedometer was reading. Were the employees using my car for leisure? Possibly. I've witnessed the employees riding on the hood of a car inside the building, and I can only assume it was a customer's vehicle. My very expensive sunglasses were also all bent up when I looked in my console. I always put my sunglasses back in their case before I put them away because they're expensive, yet I found them not in the case and practically broken. Why would the employees be rummaging around my console, let alone taking my personally belongings out to mess with? The time before last, I also found my even more expensive sunglasses on the floor under the passenger seat instead of in the sunglasses holder where I keep them. Is it really that hard to just do your job and leave people's personal belongings alone??