Aurora Health Care

I made a eye appointment with the vision center of aurora two weeks ago for an appointment on 9/18. I get an phone call at 4:59 from the vision center saying there was something wrong with the insurance and they thought I didnt have insurance anymore or it was canceled? So I tried calling back but they were closed at that time. I left a message. The next day comes around - no call back. I called the vision center at 8am the time of my appointment - they wouldnt answer the phones. I left another message - no call back. I tried canceling online - it wouldnt let me. I couldnt find out why the insurance wouldnt work and never got to talk to anyone or cancel the appointment. I am not sure why they would call one minute before they close and then never call me back.