With the available evidence you've, lodge a FIR against the concerned doctor and the hospital. This indeed is a very heinous offence and the perpetrators need to brought to the book.
Also, approach the Consumer Forum since this is a clear case of deficiency in service and medical negligence and carelessness, which needless to say was deliberate.
Send a Legal Notice to the concerned doctor and the hospital to forthwith set the things right. This step has to be taken before approaching the Consumer Forum.