We need more info here. Did you buy the "2015" from Nexus? If so when and was it sold as a used unit or a new 2015? Model years vary with every manufacturer. Often the chassis and the RV model year can vary.
Our 2012 Nexus 23P is on a 2011 Ford Chassis which I clearly understood from day one, we bought it used. But, our registration/title shows we own a 2012 coach. Chassis' have to be built first and if you bought a "New 2015" then all of the paperwork should support that but again the chassis could easily be a 2014 which does not preclude the coach legally being a 2015.
It is kind of late in the game to notice that is not the case. Did you not read what you were signing? Changes to what you signed after you signed {without your acknowledgement as in at least initials}, are not valid.
I am a huge fan of Nexus given the amazing quality and service we have received from them {even though we bought used and not from Nexus}, but if you bought a new 2015 from them they have some serious "esplainin" to do {as Ricky Ricardo would say}.
You need to speak directly with Dave Middleton at Nexus. I'm sure they will make things right.
:C
