American Family Care review: Billing mistake.

I went to AFC urgent care on 4/3/21. I had a DOT physical which I paid 150 dollars in cash. I recieved a bill for 20 dollars for methylprednisolone sodium succinate 120mg. It is an injectable drug. I did not get any shots or drugs. Billing department will not return my calls. I sent the bill explaining my situation. They just sent me another bill for 20 dollars.