Wife denying access to Son

Our marriage was solemnised in Feb 2018 and we have a 3 year old son, my wife a lawyer by degree (not practicing) recently moved out of the house on the pretext of incompatibility, due to an incident that happened in Dec 23, where she threw things at me abused my mother incessantly and finally I lost my cool and slapped her (in the past she has lost her temper and hit me 1st on two separate occasions). It has been 4 months since she left, and has been constantly asking me for divorce via mutual consent and she is living with her mother (not earning) who is separated from her husband two years ago (Not Divorced). Now I have already paid her 1.5 lacs in these 4 months and top of that has given her Apple MacBook which she demanded she needed for her job (Salary 5k at a local law firm), for more than a month now she has blocked my access to my child by blocking me on her phone and is not allowing me to see him. She lives in Mumbai at her brother’s house who is a NRI and I live in Bangalore. Please help me in what should be my course of action. The only thing that I care about is the well being of my son and to get his custody if it is at all possible. She is making wild demands like “ I should buy her a flat in Mumbai, which I can’t, give her 40-50k per month or a one time lump sum settlement”. I am not sure what my options are.