legality of call recordings

Sir, my mother and sister in laws are too good with me in front of my husband and behind his back there behavior is different like I'm a servant.. My husband's absence I was mentally harassed by them doing many un expected things.. Last Oct 6th 2017 sister in law got married and living in other part of the city here.. Now they both (mother and sister in laws) over my cell phone number stated talking bad about me. Mid November 2017 I had a doubt when ever there is conversation in between them.. In my smartphone there is a recording facility. And thus I came to know that I am just servant for my mother and sister in law. I have all the prove. I was helpless to prove my husband that I am mentally tortured by these people.. Almost I forgot to live my life. Now I can tell my husband.. Sir,this record is how much legal.. Please advise.. Now my both in laws are aware that the im having there recorded conversation with me.. Please advise how much this records are in my Faber.. Is there will be any problem with this recording.. Please advise.. Thank you for your consideration..