Minecraft purchase invalid?

I recently bought Minecraft in the Google Play Store and was able to play 3 days nicely and well. Today, a message appeared at the open, that the license expired. So I could not play. The message keeps coming up, so I thought it would be better to delete it and reinstall it. After I deleted it was required to pay again. And the confirmation email and order history are gone. Furthermore, I have no balance left and the code does not work again (logically). Now I stand there, without money and without play.

What can I do, thank you in advance.

Sign up to Google Playstore support and explain your problem.

And hope that there's proof somewhere in the system.