What happened to his account?

So this is not my account, it’s my brother’s account. He had been playing the game for like 3 months and bought 2 brawl passes. On monday, we had a power outage and today it was lifted. when he logged on today, he had to do the training thing they do to help you know the game. when he finished that, he had a fresh new account with everything gone. he did not do anything to the account. also, he doesn’t have a supercell ID with the account. what should we do?