Today, after I decided to go to the cash shop(in game), my client crashed. Then, when I tried to return to log in, my account has been acessed to another person(I guess). Changed my password and nothing. I didn't pass to anyone. I need help!
However, other than changing your password, there's also options available to you to unstuck your account when you log in onto the Aries website: https://aries.elluel.net/
Give that a go, and see if it helps. +1 if you decide to wait a day for a server reset to occur.
If not, you'll have to see when is the right time to see a GM who can help your problem.