I have no faith or confidence in this dealership s...

I have no faith or confidence in this dealership service department. The service rep told me I needed new brakes and rotors in the front at a price that is 2x higher than any other service shop. I took my car to another service shop and it turns out the front brakes and rotors do not need to be replaced as they have over 5mm left on the pads (schomp told me there was less than 3mn). The issue was just the rear wear sensor had fallen out due to a broken clip and just needed to be replaced!!! How can I trust a dealership that was trying to sell me parts and service that I don't need!!!