Pharmacy demand letter and insurance complaint — ready in 5 minutes.
Your insurance says the copay is $10, but the pharmacy charged $50. You didn't catch it at the counter.
The pharmacy says 'that's what the system charged.' You need a formal demand letter.
A complaint to your insurer can force the pharmacy to correct the billing and refund you.
You need receipts, EOBs, and a clear calculation of the overcharge.