I was not married legally in 2006 .We were just married before the parents and relatives of both s

I was not married legally in 2006 .We were just married before the parents and relatives of both sides, and accordingly to hindu rites and customs before a pandit doing" saat phere",My husband didn't allowed my father to do the registration of the marriage ..My husband is working under Central Govt. But all these years I was suffering domestic violence by my husband, mother in law, sister in laws, for more money and gold.We have two children, One 13 yr son ,3 yr daughter. I was forced to leave the matrimonial house, before four months,with my daughter any how with the help of the neighbours I reached parental house, kolkata,.My matrimonial house is in Punjab, my Husband is a Government employee and he is Punjabi, born and brought up in Punjab, Ours was an arranged marriage, I am a bengali girl, born and brought up in kolkata.. What should I do now? He threatens us on phone repeatedly..13 yr old son is been forcefully kept by husband , I am in a tight financial condition.