It sounds to me that this particular dealer must have had some problems in the past with other customers. My experiences with Chevrolet dealers have always been positive. Years ago, I was traveling through the state of Virginia and had a drivability problem with my 1984. I suspected the condition was related to the ignition module inside the distributor. A relatively minor issue. I called a local shop and was told by the mechanic there that, "We don't work on them rare dogs." He did suggest the local Chevrolet dealer. I checked with them and they were great. They sent a tow truck to my hotel at no charge, and called me an hour later with the diagnosis. They replaced the offending module and, after paying a very fair price for the repairs, I was back on the road that afternoon. To this day, whenever I am traveling through that area, I like to stop in and say hi to the friendly folks that helped me out back then.
Eric2316, Welcome to the group. Hope you find a good shop soon.