Dowry demand after marriage what law need to implement

Before marriage my husband and his family have no demand after marriage of 8th day his mother started demanding money on 10th day my husband started asking about my saving and forced me to tell my parents to full fill his demand of 5lakhs cash and 3 lakhs of gold jewelry. They started using abusive language for my parents.I haven't told all these to my parents then they stared directly called to my parents and demanding 5lakhs cash and 3lakhs gold my husband's bother threat my mother and forced to give money. After fulfilling their demand they started demanding more as my husband wants to buy a flat which is about 60 lakhs. And father during my marriage give me thing(Untensiles, colth and many more) of 1lakhs now they were denying there is nothing in the box.They used to harassed me mental ly used to scream on me,my health conditions Detoriated day by day By any means I had managed to come to my father's home. My father is not allow ing me to file fir against them.Sir i need your suggestion please which case I need to file how can i get back my father's hard earned money and my things back. Please sir help me.