Had my truck in to have some valve work done. Aft...

Had my truck in to have some valve work done. After checking out and paying for my oil to be topped off I noticed my truck sounded strange going down the road. Pulled over and checked my oil only to find out there was almost no oil in my truck! I also had another vehicle in there for an oil change and they never changed the filter. I'll never trust them with my vehicle again!