Account closed (temp ban?)

The account with the character "Chillpill" has been closed as of today (was fine last night). This is not reflected on the main page of Nostalrius (to which I can log in with no problems), so I assume it is some sort of automatic temporary account closure. I do not know what could have prompted this, but I do know that my brother, who plays on the same wifi as me, has the same problem due to too many wrong password attempts. He was told to try to reset his password through the Nost website but is unable to since he gets a message saying that it can't be done because the account was used recently. Please explain why my account has been closed, and if possible, unblock it ASAP as I am currently trying to rank in PvP. Thank you.