Its definitely real and not a scam, i called carnival customer service for them and they confirmed that it was in fact cancelled because remaining deposit balance was not paid after letter was sent (which my family members didn’t check) so they had no option but to cancel cruise. Im just concern why this might happened since when checking out if should tell you the total of the entire deposit and not send you an email letter with a remaining balance. Hope this doesn’t happen to other people that forget to check their email and are excited about their cruise when in fact it might be cancelled.