Sadly Nostalrius doesn't recover deleted characters. You'll have to create a new one and start over.
Viper wrote:Cheating and account sharing
You may not purchase, sell, gift, share or trade any account, or offer to purchase, sell, gift, share or trade any account, and any such attempt shall be made null and void.
As a reminder, a Nostalrius staff member will never ask you for your account name nor password. Please, never share your login information.
We will not recover characters, equipment or gold from a shared account. Never delete your character "by accident".