This is why you should avoid dealerships for routine service. Find a trusted mechanic, this stuff is not rocket science.
You realize the "Service Writer" is on commission, right? Gets a cut of everything he "sells". Friend of mine is a Service Writer and makes over $100K a year. Who pays his salary? That's right; you do.
Next time the dealer springs this BS on you, have them point to where the service manual says it's required.
For instance, "Fuel Injection Service" is NEVER required unless there is some problem with the performance of the vehicle and it's CAUSED by the fuel system.
Here's the BS the Dealer pulled on me with my wife's Chevy Traverse when I brought the car in for their Loss Leader $38 Dexos Oil Change with free tire rotation. The car had 11,000 miles on it:
"WOW (acting surprised), YOU'RE DUE FOR A 10,000 MILE SERVICE!!!! IN FACT, IT'S OVER DUE!!!!"
Me: OK, how much does that cost?
DEALER: "$329"
Me: OK what do you do for $329?
DEALER: "CLEAN AND ADJUST THE BRAKES (The Lie: There's no adjustment on disc brakes. And why clean them?).
"CLEAN THE THROTTLE BODY" (The Lie: Throttle body cleaning is not even on the Chevy maintenance schedule and is NEVER recommended unless there is some problem with the throttle body.
REPLACE THE CABIN AIR FILTER (I do that myself for about 12 bucks)
CHANGE THE OIL AND FILTER (I can already get you to do that for $38)
So in review, the only thing I needed was an Oil Change and "maybe" a cabin air filter.
Sorry, I'll pass for $329.
The moral of the story; tell the dealer no thanks and find a good honest local mechanic. Hundreds of them out there.