Have not used the Fredrick location, we bought our first camper (a popup) from the Jessup location - had problems with the Jessup service department but never had to pick up my camper without the work being completed, so did not see your particular issue but I do think ransoming your camper to ensure you come back is strange.
When shopping for my second camper, I looked at a Roo at the Fredrick location - was not impressed with the sales office - and they wanted a ridicules amount of money for dealer prep. Like DaGrinch, we ended up getting the same floorplan in the Flagstaff version from Keystone. We drive by the Fredrick location to get to Keystone, but so far they have been much better to deal with then Chesaco was.
Keystone advertises on their website that they will work on your camper, even if you did not buy from them - I know this does not help for the current issue, but maybe next time you need service - might give them a try.
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
Traveled 19520 miles and 209 nights in 7 years and counting