Unfortunately, this type of situation is a typical "your word against mine" case. If they accepted reports of this type, a player could act in bad faith and transfer coins to a character and then claim that this character hacked his/her/their account.
You can try your luck and open a ticket if you want. I don't think this will cause any problems for you, but I particularly never saw any player who was hacked manage to recover the coins that were stolen, and they definitely won't return any item you lost.
Note, however, that they cannot share hacker data unless you contact your national police and request a legal investigation.