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Helloย @Carolย I am not too sure what what you are referring to. What do you mean every time you get 6 you should get one UFO?
The only features I know of that provide a UFO are the 12 day Treat Machine, the Season Pass and an advert feature that appears when you fail a level. Are you having issues with one of these features?
If your issue is a purchasing issue then I am sorry to say that this forum can't help you. All purchasing issues have to be dealt with by Player Support or your app store operator.
You can contact Player Support using the Help function of your game.