Did the dealer take the door apart and physically adjust the window, or did he do it with the window raise/lower button?
I live where the world freezes this time of year. Every now and then the window freezes and won't lower that small amount when I open the door. When that happens I have to strike the top edge of the window downward with the heels of my hands to cause the window to break loose and lower as it needs to. Occasionally the window gets a bit confused and I have to reset that adjustment.
Here's a link to how to do that (bottom of the post) in case you ever need it.