False Advertising

I usually enjoy going to the Burger King and never have a bad experience but today I received bad service as well as bad advertising on their slip they indicate that you get a free jr whopper on your next purchase just to go today and find out that even if you purchase a next meal you have to buy the drink and fries for that jr whopper I find it as false advertising they must stipulate it has to be for that specific jr whopper not just your next purchase