Oil change service near Darien, IL

I stopped at the place to check loud noise seemingly coming from my tires, but after a "dedicated" checkup i was given a quote for 960$. The Problem was both my front wheel bearings, they said. The price of each bearing without the labor was over 300, the guy told me. I took the car elsewhere and they fixed it for 250$ with labor. Apparently it was left rear bearing that was wrong, not the two front ones as they told me in Cassidy Tire and service. I replaced my rear bearing and the car is running like new. IF there was a place to upload pictures i would upload the quote i got from Cassidy Tire and Service and the place that i actually fixed my car in. How can a licensed mechanic tell me two of my front wheel bearings are bad, when actually it was a rear ? I'm so glad i didn't fix my car there and i advising everyone i know to do the same