But I can't remember my account name.
Hi and welcome back ^.^
I saw your post in General Discussion, too and there are many, many people who love this game, so i think you will be encouraged to return!
We have had instances where accounts have been locked as a security precaution.
To do the Recover a Lost Account
ticket as minuzaki has nicely suggested, you will need to know your account name. If you were able to receive an email about the "violation of ToS," then your account name should be right in that email, probably in the subject line.
If you find your account name, be sure to answer all questions on the Recover a Lost Account
ticket as fully and accurately as possible. It would help if you included any details about your account such as character names, classes, even sprite names or gear/weapons/vanity items on them--anything and everything to prove that you are the account holder.