The error with a wrong salutation must not indeed happen, but such errors happen anyway. I'm afraid you're the one who's affected. We apologize to you for that. However, you must not generalise your experience. It's not objective. After all, you don't know how many applicants we have to reject and you don't know whether others have had the same experience as you. I would have liked you to have called or written to me personally, as others have done. You have heard correctly, others have already received a faulty rejection from us. Because we're not flawless. Allow me to make two more remarks. - "Derb" as you call this mistake is this clearly not. - Why would you like to take this position?