The password you are using for your Brain Wallet is weak. It is publicly available on Internet (GitHub) and already used for dictionary attacks. To protect your funds, we locked your account. To retreive your funds, a) Prepare new simple wallet b) Prepare a screenshot of the account screen in your NanoWallet. If a certain amount is exceeded, more detailed identification may be requested (one or more of SMS, id scan, selfie holding your id, skype call) c) Post a message in the forum https://forum.nem.io/t/8147/