Took my 2016 Ford Explorer in with 50,000 miles fo...

Took my 2016 Ford Explorer in with 50,000 miles for 2 recalls. They did their Multipoint inspection. Came back saying I needed rear breaks.
Okay how much is that?
$275
Well was billed for $306.59.
Kinda makes me paranoid when I bring my Explorer in for something that is free. Walk out with a $300 bill. Guess they have to find a way to pay their service people.
Also Ashley said she would leave an appraisal in my car. Wasn t in there, but just got a text saying it is worth $28-$28,500 range
Also one more little gripe
I have a Pearson Ford preferred customer sticker in my windshield. What the heck does that get me? I ve tried to get my oil changed there but are always turned away because they are too busy .