Without a human to contact, you have no recourse. The email that you received denying your request for re-evaluation is no-reply@big.co, so you're stuck. It is a surprisingly awful feeling of helplessness. In fact, if a human on the other end of the phone were to say, "I'm sorry, it doesn't say why, but our system won't let you back in.", you would probably feel a little better because some soul heard you.