Cruelty by wife

I am a psu bank stuff, arranged married 2yrs ago, permanent address is in kolkata for both of us, presently living in mumbai for job purpose. My wife is an MA nd doing some private tuition nd working in play school aswell. After fewday of marriage she started fighting with out any relevant reason. Tried to console her initial days but day by day she is becoming more vulnerable. Speaks any foul language to me and about my parents althogh they live in kolkata. Now she getting physical to me even spited on my face few days before, always threats me she will go to police , come to office with false allegations like dowry phsical torture etc. Previously i told her mother regarding all these but she also put all the blame on me even threatening me in the same fashion using unuttarable language couple of time so i stop calling them also after any such fight. I lodged a GD at local police station after one of such recent incident with out her knowledge. I wanted to get separated and then file for divorce other wise she will surely try for 498. Previously she nd her mother always in for divorce but when i have agreed she denying the fact. I collected some of her apology in writing whatever she does and some hidden video of the some recreated incident like infront of someoneelse as we describing what has happened. How to have judcial seperation or any other advice to have safe guard for me and my family in kolkata, as me and my dad both are govt servant.