My account it's been from Lvl 13 to 0

Hello . I encountered a problem last night. Somehow my account it’s been from lvl 13 to 0 I to start over
What can I do to recover the lvl I got 2 days ago?
Waiting for an answer

I suggest you immediately contact Game Support:

DONT delete your game or make any changes until they tell you to. Be ready to give them all your account ID information (found at the top of the page in-game: Menu > Options > About)