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If you have been "hacked," if you can access your NCSoft Master Account using your account username (not the NC email) then you can save your account. Whoever is doing this is not changing the NC master stuff, apparently.
If you can log in to your NC account, you can see the email for your Guild Wars (and 2, if they are linked) accounts. You can also change the password for your GW account. Knowing the new email and having changed the password, you can log into the guildwars2 website and change your email to something else (I would NOT use the same email as before).
If this works for you, please bump this so more people see it. We need to spread the word for those who have fallen victim to phishing or third-party sites or whatever.
If this works, you should change your GW password, your NCSoft password, and any other game passwords that are the same or similar. Having breached you once, they are more likely to try again to get that account in the near future. It would also be a good idea to update your security questions at NCSoft, and de-authorize all locations. You might also want to change any fansite passwords to a third, different password to prevent future attempts later. Remember to make fansite passwords and game passwords different, and make those different from master account passwords. Make all these different from real-world services like banking. You can never be too safe, and even if you have several passwords like I do, it is better safe than sorry.
"There are two great powers, and they've been fighting since time began. Every advance in human life, every scrap of knowledge and wisdom and decency we have has been torn by one side from the teeth of the other. Every little increase in human freedom has been fought over ferociously between those who want us to know more and be wiser and stronger, and those who want us to obey and be humble and submit."
John Parry, to his son Will; "The Subtle Knife," by Phillip Pullman