Board Thread:Questions and Answers/@comment-29683318-20160504021013/@comment-24956068-20160504070501

It could be because your father's registering another LINE ID with the number you used to associate with it (thus, it is "hacked").

So please try logging in normally with your email address and password, then if succeed, verify your account with a new phone number. This will revive your account and your Cookie Run progress, but not your friends list.