What legal steps for abuse, dowry, defamation, and abandonment?

I am seeking legal help regarding emotional abuse, dowry harassment, and defamation by my husband and in-laws. I suffered mental cruelty during my pregnancy, which led to a miscarriage last year. My husband was silent and unsupportive throughout. My mother-in-law falsely blamed my mother for the miscarriage. They returned dowry items (cot, bed, cupboard) after using them for over a year, likely to avoid legal liability. My husband has since moved to the US without proper discussion or making arrangements for me, effectively abandoning me. He is now non-responsive. Meanwhile, my mother-in-law is spreading false stories in public, damaging my and my family’s reputation. I live in Chennai, while they are based in Madurai. Please guide me on jurisdiction and the next legal steps I should take.