Though allowed, but account sales are not encouraged in this forum. So if you bought those accounts and they got blocked, no mods are gonna help you unblock them. You can only request for something like this if the account is yours but not a bought one.
the owner gets a notification, when email or password is changed. He gets a link to lock the account and can do that within 14 days.
Oh, that is a nice feature actually, but i still can't understand how the accounts OP bought got blocked if that is how it works. The seller would not lock the accounts if he already sold them. And if he is trying to scam the buyer, what will be the case if the owner locks the account? Will he be able to access it back then?