After making an appointment & showing up, they said they couldn't see my child or bill my insurance because it wasn't time for her well-child check up yet. So my child can only be seen every 3 months?

My baby is 18 months old. She got sick today and we came in the office. At front desk, I was told I was due a copay from last visit in March this year, I explained I didn't receive a invoice in the ma