second marriage

Assalamu alaikum wa rahmatullahi wa barakatuhu!!!

Iam a 23 year old married gal. This is my second marriage. I lost my husband from my first marriage of 1and a half year to a heart attack. My parents got me married to my maternal cousin a month ago. His is also a second marriage. But he is not yet divorced his first wife which was the promise made by his people during their proposal to me. Only when they said that he would divorce her my parents agreed for this. And asked them to get things settled and cleared first and then plan for our marriage but they insisited on the marriage to happen soon and before the divorce because the guy's mothers' health was deteriorating and she wanted me to be her daughter in law. On their assurance my parents agreed and got me married to him without informing any of our relatives since they would not agree for it.

The guy's mother(my aunt) was very happy during the marriage and everything went well. But a few days later her behaviour changed. And it changed real bad. She started taunting me for having come into her son's life as people from their family started pointing fingers and accusing them of deceiving their first daughter in law. She would lock me up if anybody from Her relatives visited the house. Each day got more and more difficult for me.

And on top of it my husband told me that he never had any intentions of leaving his first wife and got married to me just for his mother's sake. And that he will not divorce her until she herslef asks khula. Because if he divorces her, he has to fulfil her demands which he is not ready for.

I feel totally devastated after this.
His first wife has filed a dowry and maintainance case against my husband and his mother and two of my sisters in law. My mother in law is blaming me for this and has thrown me out of their house. Now she says that she would request her first daughter in law to take back the case and return home assuring her that i (second wife) will not return.

My husband, however is saying that he would not leave me and take care of both wives.
My parents are adamant that he leaves his wife if he wants me.

I am now staying with my parents. And he has not come to see me or contacted me over phone ever since i came here.

My parents are deeply aggrieved and are inconsolable.

Please advise.

Jazakallahu khaira!!!

But the nikah took place in the presence of my maternal uncle (mother's brother) one of my cousin brother my father my mother my husband's mother and his two sisters. And we do have the nikah naama as the proof.
Is the marriage still invalid?

How can the marriage be valid when they've lied to her and deceived her to marry her cousin?

And now i do not have any identity. My parents are not very well-off. I had a job in a reputed company which i was asked.to.leave by my in laws. Iam financially suffering now andmy husband has till.date never given me.a penny for myself.