I think I got a killer deal...

Push370zzz

Since Base delivered is around $30,800 and Sport delivered is around $34,400, the difference is $3600. You got it for $27000, which would be a $7400 discount off of a Sport, or roughly 78%. I would start with demanding a similar price deal on yours, which is around $3k less than you paid. Will they write you a check for $3k? Probably not. Maybe you can settle around $1500-2500 with them, in my opinion that would be fair.

Anecdote.........

My last car prior to my Z was a used 2012 BMW 3 Series Sedan I bought back in Sep of 2012. The dealer advertised it as though it had Premium Package (which retails for $3100) for a sale price of $37500. I negotiated a price with them which was a steal, $34000 (new they were roughly $47k in with the options it had), and then upon arrival to the dealership (4 hour drive) discovered it did not have Premium Package. I confidently told them I would buy it if they took off the MSRP of $3100 for Premium Package expecting them to counter with $1.5k or $2k which I would have definitely considered. They just said yes and sold me the car for $30900. Of course, this was prior to any transaction so different than your situation but the point is, you have the ball in your court because they misrepresented the situation AND have already taken your vehicle in on a trade. They may be unable to reverse it. Go in there heartbroken about the SRM and wheels and "deception" and go get the deal you thought you did.

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Range Rover Sport Supercharged
Nissan 370z Touring + Sport