After that,he got message,what his account is locked for investigation.He wrote email to [email protected]
on 17.02.2018 but got no ansver.
The reason that the accounts are locked is because the May 2015 hack leaked Bitcointalk's database which did not securely secure the Secret Question and Answer. To prevent people from guessing the answers, theymos made it so that accounts that are recovered using the secret question are automatically locked when the option is attempted. This is to prevent hackers who may be able to guess the answers from the leaked database.
Take note: Recovering accounts, take a very long time (not a priority for admins).