If you wish to file a case of dowry harassment against your husband and your in-laws, then you can do so by filing it directly before the magistrate, this can be done either at the place where the marriage was solemnized or where you are currently residing or where you were permanently residing U/s 200 Cr P C. this is called the Private Complaint Report (PCR), the magistrate will record your sworn statement and register the complaint and direct the police to register an FIR against your husband and his parents.
in order to do this you will need to contact a good advocate where you wish to file the complaint.