I went to the hospital with my kid who was in a lo...

I went to the hospital with my kid who was in a lot of pain. We had to wait for 3 hours for the doctor to come. He was in charge of three wards. When he came to my son he discharged him after examining. Now i am getting a mail telling me that i have to pay 15 dollars for a test they did after we left the hospital. They did not even called us to give us the test result