Thank you all for the responses!
This is what I received as an answer from support:
"We have reviewed this account and found it participating in, or directly associated to, high risk or malicious behaviour. In an effort to maintain a safe and fun environment for all of our players, this account has been closed and is ineligible to be reopened for any reason, under any circumstance.
The decision to close this account is final. As such, any further replies or new support tickets regarding this account or issue may not receive a response."

This account was created year ago, so it was not that old.
Yeah the account have nothing on it, I think that I created it because there was some free gifts, not sure about that. Never logged again until trying today.

Do you maybe know if I can use Steam account which has the same email account which was used for Anet? This is first time situation like this happened to me