Amri Hospitals — amri hospital salt lake

My dad went for a ct angio in mri salt lake on 22nd august.
When they took him in, he was given a double dose of betaloc due to which his heart rate started fluctuating from 25-35. Following which he was admitted to the emergency ward after which he was kept under observation for 24 hours. On 23rd august, they finally conducted the test and discharged. The total bill amount was 35 thousand rupees. The normal rate for the angio test was 10 thousand rupees; but we were charged 22 thousand for the test itself. This is unjust and illegal.