I submitted a ticket. My sons account has been hacked and the person is playing it right now on Crystal Desert (moved worlds). Interesting that when I checked his email today starting Tuesday night there is 20+ emails from GW2 saying someone from China was trying to access account and to please validate.
I think that what happened is the person who had access to your account engaged in bad behavior, probably spamming “Buy cheep GW2 gold at [some stupid RMT site or another].”
The team will get this sorted for you! I think you already submitted a ticket, but just in case, do contact Support by filing a ticket through the “Ask a Question” tab on that linked page. For tips on what information to provide in a ticket, please read this post.