If your game account has been linked to a Facebook account, you can restore it yourself.

Follow the instructions below:
1. Open the settings of the game.
2. Press Not Connected.
3. Enter the data of your Facebook account and confirm the loading of your progress.

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If your account has not been linked to Facebook

Please submit a ticket to the customer support and specify the following information:
1. In-game nickname of the lost account.
2. Level of the scientific progress.
3. Internet providers / mobile carrier service providers you used.
4. Cities and countries from which you accessed the game.
5. Model of the device the game account was created on and models of all devices that you played the game on afterwards (for example, Samsung Galaxy s4, iPhone 4 etc.).