Found out insurance does not cover orthodontics the day my treatment was starting

Hi I’m not sure if this is the right place to post this I am looking for advice. I need braces due to impacted canines not for cosmetic reasons. Today I was supposed to get braces and then have surgery. I am 21 and a dependent on my parents insurance. As far as we knew the insurance covered orthodontic treatment. The orthodontist messaged me this morning only a few hours before my appointment saying that my insurance does not cover the treatment. My parents do not want to pay out of pocket so I am trying to find other options of what to do when you don’t have insurance for braces. Any good payment plans or insurance suggestions? Thank you