Contested divorce on Mental illness, cruelty, cheating by wife and their family

Hi, I am planning to file for contested divorce petition on grounds of mental disorder, cruelty, cheating against my wife. We have been married for over 3 years (No kids) and its been like attendent to a patient from the start. We were cheated by wife parents without disclosing any info. of mental illness & medications before marriage. My wife and their parents have slowly opened up giving Blackmagic reasons after marriage to avoid annullment within first one year smartly. I was busy going to work and assumed things will be alright soon. Do you think what cases can be filed, My wife has been taking medications continuely since 3 years incurable +1 year before and can't go for pregnancy as per guidelines by phychiatrist, psychology, gynaecology She has severe OCD with killing, sucidal and harming thoughts always we also gave Electricshocks, and all kinds of treatments in Nimhans. Her parents never came to see abandoned completely washed their hands escaped. She also has pcod, sinusitis which was not disclosed to us all evidences found in confession reports after I investigated Now she also agreed for MCD signed one agreement asked me to move on in life and settledown with healthy women. She has left home it's 10 months almost n now backtracked from mutual consent and threatning me on whatsapp vulgar, obsence, cruelty, insulting msgs, their parents are liars family who are inflencing her and don't want divorce seems, she only said once. I it so much wexed running to Emergency, Hospitals, Mental health clinics etc . I just want my freedom so I can move on with my life. Kindly advise how long it takes for divorce grant as my lawyer said it's a clearcut case don't waste time filing complaint in policestation. Inspector was kind says goto court and file a petition when full evidences there and submit complaint in station for safeside given receipt of complaint filed as well. I sincerely thank everyone here for all the help