How can I file case against my in-laws?

I wad married 4 yrs ago & have 3 years old twin boys in Hosur . My husband is of good character but his maternal aunty (chithi) who arranged our wedding, his sister & his mother are mentally torturing me for past 4 yrs. My husband came from udumalaipet in 2006 for job purpose & stayed at his chithi's place in hosur itself. Then after few years he got job in Chennai so he went there. Then in 2014 we got married through a common friend of my mother & his chithi. She asked for dowri & burdened my parents on entire wedding expenses also. My parents also accepted & marriage was done in hosur. But later we came to know my sister in law didn't like this marriage & she started insulting me my parents my siblings but my husband didn't understand her activity & he kept supporting her & his mother & aunty also. Before my wedding my sister in law was in her house with her husband & two girl children & that house was samathuvapuram house given by government as she acted she ia poor. After my marriage her family shifted to my father in law's house permanently by renting that government house & started harassing me mentally along with my mother in law. Then 4 months ago my husband rented a house in Chennai & took us there, my mother in law also came to stay with us & my father in law was in udumalaipet. But here my mother in law wad mentally torturing me so i came to my mother's home in Hosur & still here only. Now for vacation my sister in law has sent her children to my house in Chennai but she will not talk to me & she takes rights through her mother. Now my husband started to realise about his mother & sister but he is afraid to talk openly as they will create bad name for me but I can't live in that situation. I need divorce or need to live only with my husband without my in laws. Please advise me.