What to do if whereabouts of the wife is not known

Ever since my marriage my wife has the habit of picking up quarrels with me and my parents on some pretext or the other and has left her matrimonial home on a number of occasions. Other than her short period desertions, she stayed away from me from September 2010 to July 2016 at a stretch. After repeated persuasions I managed to bring her back in July 2016. A die hard lady deserted me again just after a year in July 2017. I presume that she has been getting support of her mother and living with her through out I got her fixed as a teacher in a school and my son admitted in Class V with a hope that she would soften to some extent. To my surprise, I was informed by her school authorities that she had left her teaching job in April 2018 and at the same time obtained a TC for my son, and left for an undisclosed destination. My calls on her and her mother’s mobile number have since gone unanswered and presently, her whereabouts are not known to me. Please advise.