I'm sure the dealership charged you the allowable time for each "individual" service job, even though they where combined and done within the same hours. I didn't see Air Filter Change on the list which would make $816 more sensible.

It is true you can't be sure any one or all the service jobs where actually done. Unfortunately, the only way to be sure is to do it yourself.

I "usually" find doing my own maintenance is therapeutic. Right up until...something goes wrong. I will NEVER try to mount my own tires on rims again.