Medical Negligence

My wife was diagnosed for Endometriosis and advised for surgery. She underwent series of tests in which MRI and CA125 pointed possible malignancies in tumour/cyst. After taking consultation from various doctors, the suggestion was for open surgery and complete hysterectomy. The doctor we went ahead with, also advised 90% for open surgery. She later suggested to check with laparoscopy camera and decide at the OT table whether to do Laparoscopy or open surgery. She finally conducted the operation laparoscopic. The histo-pathology report of removed organs deducted endometrial carcinoma in one tumor. This came as a shock to us. The pathologist from same hospital was amazed the way operation was done i.e. tumour broken in pieces. Had she done open surgery and removed organs in single piece, the cancer would have been checked at that stage. Now my wife will have to go through resurgery in order to remove lymph nodes and some tissues. Besides this she has to take 6 chemotherapy. Still recurrence chance will be 5%. Had the operation done properly after checking the test reports properly, all this post operative cancer therapy could have been avoided. My wife and whole family is disturbed with this careless operation. The mental and physical strain alongwith future repercussions could have been avoided. I seek your legal advise to how I can take forward this negligence on part of doctor/hospital. What all rights I have to seek compensation or punish them. Thank you in advance