How to tackle Police harassment in divorce case with false allegations

Hi my brother is been married for 8 years now and has a boy. His wife always had fight with him and the family. Its been high time and my father disinherited them. They shifted to other city n child ws wd us fr his studies... After one year samr issues s continued and she went to her maternal house and my brother filed a divorce case. Nw the child is still wd us and they are living separate. She has filed false complaints against us all for dowry anf domestic violence. N we hav visited ASI, DIG AND SSP. Court case copies available were also submitted to thm. Bt few police persons known to the girls party are harrasing us. They r calling us to police station every now and then and threatening us that they will put sm case against us all... We just want court to decide on ths.. N dnt want police to harras us like ths.... Pls suggest how to tackle police harassment.....