If you suspect someone of hacking, you should Log a Ticket on the Nexon Support page and tell them about your problem.
However, you may need to create a new account.
In that case, you should go to http://maplestory.nexon.net/WZ.ASPX?PART=/Support/Security&index=2 to help you learn how to choose a Password and to help you learn how to protect your password.
Remember: you should NEVER EVER EVER IN A MILLION YEARS give your Nexon ID, Password, or 4-digit PIN to anyone ever!!!
