Hospital and Doctors Cheated, my brother died

Location/place: Bangalore

Name of company/service: House Maid

Hello Sir,

I live in Bangalore. Few days back my brother was having pain in her legs, we admitted him in hospital, his pain grew more and his leg swollen too much.
We shifted him to Manipal hospital.
Within few days, my brother died. We asked doctor why, they said his both the kidneys failed.

One of the nurse said that, the doctor gave wrong medicines and over dose, which lead to his death.

Sir, please help me how can I get to know that the doctors didn’t killed my brother.

I am giving my temporary contact number: 89171113344.
Please contact me and let me know what can i do.