This scam is similar to the outdated Password Scam where a scammer would say "Hey Jagex blocks your password see: ******". Well an update was made so that this would actually happen but any slight variations such as putting full stops in would allow it to go through. This is the basis of this scam. The scammer will usually have another internet window open to change the victims password once they find out what it is, this way the next time the victim logs out the password will be reset and the scammer can acess the account. There is a chance that you can recover your account by using your recovery questions on Jagex's "recover a lost account" page.