Defamation

I've a sister and her in law
has tortured with abusive words and filthy language since the very next 2 days of marriage. Has taken the gold and Also influencing her son (my brother on law)negatively against her wife(my sister). my sister's mother in law and her sister in law is not letting the guy to stay with his wife. Behind all this situations the lady is defaming my parents and our family. the people started asking questions to me and I didn't believe as the allegations are that much of worse. However, later I deep dived in all this talks and found out that they were truth. It's been nearly a year now and hardly 10-15 days my sister stayed at in laws in Beginning and later she's at home. Such women's should be punished so that every daughter and their parents should be in peace after getting their children married. I need a help on this and it's an open and shut case of section 499 and section 500..
Seeking justice and I have all the proofs gathered and just wanted to make her pay for what she has done and doing since 10 months....

Suggestions and help is much appreciated
Thanks,
Av S