How to file case against black magic

My name ia Gautham Krishna im from kerala .I'm doing my final year BA LLB. Me and my family have been suffering from last 10 years . we never had any progress in life. Me and my family had been suffering financially very badly . my father met with a major accident recently.me and my family are very hard working and have tried everything possible to succeed in life but we fail continuously. We have issues with my father's family . they tried to kill my father when I was in 1st std due to property partition issues . my father was not given an righteous properties amd his share . my family was literally kicked out .after that we dint do anything or took any actions against them. We just lived our life and left the rest to karma . my father's family is worst than demons . after having continous problems in life everyone started asking and suggesting us that there is something wrong and something evil is haunting our family..so finally we decided to go to an astrologer and get this checked and we came to know that my father's family has done some black magic so that we never succeed in life . that astrologer had clearly told us the reasons properly that since last 10 years these people are performing black magic for our downfall and it is effecting us as they planned . They are just scared that ill drag them before law for the injustice they have done . my family is in a bad condition because of this .kindly please suggest and advice me on how to I bring this injustice of there evil practice before law in kerala . what are the steps I should take .how do I file a case against this . please help me . me and my family are in serious trouble . I want justice. Since this is black magic I dont know how to gather evidence and bring them before law.kindly help me