We’re sorry that you’re may be facing this problem… 🙁
However… Reinstalling the game may solve the problem.
Make sure that you have saved/synced your account to Facebook, Google Play Games or Game Center, before proceeding.
You can learn how to sync/save your progress, by checking the My Account section, on the FAQs.
If you need any further assistance, please contact us via in-game support.
See you on the battlefield! 😉