Resign from the contract of sale?

Hello community, we bought last week a Ford Focus (Bj 2012, 21,000km) from a Ford dealer from the area. To the test drive we got a black Ford Focus of the Champions Edition with all kinds of extras. The seller promised us to get the same car (with the same extras) in red. Three days later this was there, contract was signed, car picked up and registered. The buyer noticed the following problem at home: the car has been contrary to the s Although the seller had promised us the same equipment, the purchase contract of the car only says that it should have an automatic climate control. Nevertheless, we are disappointed, because some important extras are missing which have been promised to us! What can we do? Purely legally? Resign from the purchase contract? Or are we with such a lack at a What does the official legal situation look like? How would you handle such a thing? Thanks for the answers!