They told me on the phone something was covered by...

They told me on the phone something was covered by warranty so I drove 90 minutes to the dealership, but when I got there, they said it wasn't and would cost more than $300 to replace. I went elsewhere and got a replacement for 1/3 the cost. If I had known they weren't going to cover the part by warranty, I would have saved the time and mileage and bought locally!!!!!!