The Kia is here, but… wrong color

Hello Kia municipality, in March the order of a Kia Picanto was ordered in a blue metallic color. At the beginning of June the car should be there. In mid-June then came from the car dealer the call that the car was now delivered. Why ever pulled that and in the past week you got the data to transfer the purchase price and the dealer wanted of course the EvB number. Said, done. Today the seller called and said that he had a good and a bad Nachric The car is registered and then he called the bad…. The car is white instead of blue. But we would be all people, as he said. Now it should be chosen whether the white car is taken for a new price, but without the extra charge of the metallic color or it has to be waited another 6 weeks, because the car has to be ordered. What is not understandable is that the car was at the dealer’s two or three weeks, and he had not noticed that the car has a different color. What can you do? Best regards