BP Campaign - Limited addition collectable cars - but these cars does not exist????

How can you run a campaign and offer items and does not have these items to give to the people . I qualified for a collectable car. Went to about 10 BP service stations where the answer in all of them was the same. Head office keeps on promising us cars but we do not get them. You cannot run a campaign an do not have what is promise to the public at hand. Honestly ????? False adverti*****t !!!!!