Husband already married without informing before marriage

As my husband has illegal relationship with a old lady before my marriage in 16yrs itself. That lady name is Karimunisa, she's s aged above 27 yrs , she's a mother of two children that time & my husband was 16 to 17 yrs. She had illegal contact with my husband Irshad before her husband Riyaz. We both got married on 2013 June 22nd. We have two sons now named Muhammad Usman 3yrs & Muhammad Arshad 2yrs. My husband cheated me regarding his affair saying that she s my wife. I was not aware of that even my in laws members didn't say anything about it. I married Irshad against my parents. But at present nobody supports or coming forward to help me. I need justice pls kindly help me. I have small two kids. Whatever he earned 2yrs in Saudi Arabia , he have sent that money to that Karimunisa Only. I've proof for everything against my husband. He used to send only 12k or 15k per month, but his sal