We provide a Lifetime Guarantee on all of our LoL Accounts, but it should be no more than twice.

It depends due to our automatic authentication system.

Suppose you have bought an unranked account or Wild Rift account. In that case, you need to change the email and password immediately.

Unranked LoL Accounts/Wild Rift Accounts – a username and password Ranked LoL Accounts – a username, password, and a mailbox

If this happens before binding your own mailbox, then YES. If this happens after binding your own mailbox, then NO.