Most of the accounts login/password are so complicated that it's impossible to login if you don't have the exact information. Plus the fact that we got an "anti-bruteforce protection" makes it impossible to use a bot for password finding. In most cases, when a player says "I was hacked", you need to translate it to "I lent my account to someone one day and he did bad things on it some hours/days later" or "I bought/sold an account on a website or skype and am trying to change information".
In this case:
* Login username is completely different from the character name, so it's impossible to find unless someone gave it on purpose,
* Forum username of this account is different of his ingame account name,
* This account was used by people from different countries the last 3 weeks,
* Information above clearly show that this player did account's sharing,
* Someone (not the owner) logged into the account, and deleted the character 30 seconds after connecting, meaning he knew the password and connected to the account deliberately to delete the character.
Term of Use clearly state that account sharing is forbidden because there is a high probability that items or gold get stolen, or worse.
It's not possible to restore a character that was deleted from an account.
Player is fully responsible of his/her own account access:
Password should be complicated,
The password should not be shared with anyone,
You should connect from a safe place,
Don't delete your character "for fun".