It may be a lot easier than you think. After you point out the error, they will probably try to be very accomodating. After all, I think that what they have done is illegal and you do have documentation (evidence). I'd try to be nice about it (at first) to give them an opportunity to acknowledge their mistake and fix the problem and be clear to them what you preference is (ie new car or refund).
Hopefully you won't have to escalate things to the manager, nissan corporate, or legal avenues. I would also recommend that you go to the Nissan website to see exactly what is in the Sport package so you can point those items out to them. Good luck.
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