Dealer refusing to do Warranty work?

Well, I knew it was too good to last. One of my listed warranty items was one of the rear fog lights did not work. When the dealer contacted Winnebago, the factory said I needed to have a Mercedes dealer look at that item. I said ok and considered the case closed. Talked to dealer this AM to check progress on all the other items. He said they are making progress, parts are ordered, and most adjustments should be complete today. They said they decided to pursue the fog lamp issue anyway and found out the Era only has one fog light, i.e. everything was working as designed. Ok, good to know. Then the dealer went on to tell me that I would have to pay their minimum charge for diagnostic time for a non-factory warranty item.. one hour - $110. I asked to speak to the Service Manager, he basically repeated what I was already told.. they need to recoup their costs. We went back and forth, after a few minutes, he finally stated "Ok, I will not charge you THIS time, but I think you need to come and pick up your RV right now". Unbelievable!!! So I called the factory again. The factory wants to talk to the dealer again.. meanwhile, here I sit waiting to hear back from Winnebago praying the dealer is not going over my RV with a hammer or something.. what is wrong with these people????