what should I demand?

God-Speed

First off you are dealing with the salesman not his boss. Get the name of the GM and go from there. When you talk to him tell him the story and be polite and professional. The odds are from what you are saying, he knows nothing of this and if he or she is a good GM he will make it right. The last thing a GM wants to hear from is an unhappy customer that just bought a new car. Don't believe the salesman whey they say they lost or made no money on the deal. They have hold backs, rebates and dealerships will also have spiffs on cars. Hope this will help and good luck.