Dowry demanded

Hi, This all starts when my family was looking for a guy for me, so there I met this guy and he looked well mannered and he's captain in an Indian army so we said yes. Then his family forced us and convinced us to get engaged asap, we thought family is so there's no problem in getting engaged so fixed the engagement but during this period his family demanded dowry, when I got to know about this I asked the boy but he said no there's no such demands but on the day of engagement his family took 6-7 lac cash and other expensive gifts which includes gold as well from my family. After 2 months when wedding date has been decided, they again started demanding cash and other things so finally I decided to call off this marriage and out of anger texted that boy about this and he has saved those messages and his family started complaining about this to my family and said your daughter has misbehaved with our son and denied to marry so now we are not giving anything back to you and do whatever you can and if you want to file a case , go ahead cause India me kuch nhi hota cases ka and our son is in army so you can't do anything and they also threatened us on name of defaming and said ladki ki ijjat uchhal denge. Please let me know how can I resolve it and get money back.