I received a coupon for free state inspection and ...

I received a coupon for free state inspection and took my car for oil change and inspection. Before I go my car back, I was not only charged $16 for a "free inspection" (which was marked as such on my receipt!), but they have also found $1300 worth of other things to be fixed. I have been taking my car to a dealer in another state for many years and things that have not bothered any previous service call or mechanic became a "must fix" problem for my car. Furthermore, they thought they did include a discount for some of the services they provided but turned out none were applied to my bill and did not bother updating the bill to correct any of it. I wish they were more accommodating to the customers.