Minecraft bought but can't open?

I bought Minecraft at the Google Play Store today and I also got a confirmation email. But I can't open the game so it's not even downloaded and I can't download it any idea why that is maybe I'm just just stupid.

Look again at the account with "previous purchases". If the money is still there you can try it again. If not then you should look in the support over, write an email or call. They can help you the best.