Sourav From Bangalore want legal help in medical malpractice in surgery

I was admitted to a very well known hospital for transplant surgery,and they performed surgery without resolving issues and always gave very small window to decide and would always say if you don’t do this surgery you will loose kidney.
In just 4 months I have paid them nearly 40 lakh rupees where as earlier they said it would cost me only 6-8 lakhs only.
Please help