Raynor Dental

I was told my insurance would cover my emergency visit for a broken tooth in December. I was not informed by Raynor Dental until March that it was not covered and they wanted payment in FULL immediately. I a said I would pay weekly, which I have done what I can afford $20 per week. I received a bill ,finally, saying I was 90 days late and they charged me a fee! I was not told I owed it until March, how can I be 90 days late? I just received a voicemail from Lori that my payments of $20 per week