TBH, it sounds to me like you should have done your homework on the differences in geometry. It even further sounds like you got a bike you don't like even though by the recommends it "should" fit you. In lieu of putting it up for sale and returning to a geometry you are comfortable with, I might suggest you keep working with them to find a fit that works for you.
Ultimately you could try to "lay blame" on whomever selected the size, as I am unclear who made that selection. You say you didn't, you say they didn't, so how did this frame size magically appear?
I would think that going to a size that much smaller, in the lower selection, would create fit issues of it's own.

Call it a bad choice, or work with it. I don't personally see that its the dealers fault with the information you have given here. I may be missing or misreading something.