Johns Hopkins Wilmer Eye Institute (JH) insists that I owe them 30.00 for a visit I paid upon arrival. I produced all the payment evidence and wrote them. I called JH. They told me I had paid the doctor office but not the hospital. So, I called my insurance co. - they say I owe nothing. JH referred me to a collection agency which sent me a bill. I need to know what may happen next.