Husband not taking care of the needs and expenses of his wife and children

Q: I am a working woman and married. Both me and my husband are working in respectable jobs. I handle my own personal expenses from day one of marriage and have never asked for pocket money from my husband. 

I have two children aged 1 year and 1 month. My husband refuses to help in the my children's financial needs. Both of them are on formula milk and their combined expenditure is around 80000 which I am solely bearing along with my own expenses. 

My husband's income is more than me. He refuses to contribute even half. Alhamdulillah, I am managing but my question is what are the rights of such a husband/father over his wife and children if he refuses to contribute even 50 percent financially if he has more than enough money. What are the faraiz and instructions for the mother/wife in such a case who despite being married is living like a single mother?

Explaining the serious consequences of uttering the words of divorce to one's wife

Q: When I get angry I used to say divorce me to my husband. Then to explain he said "I divorce, I divorce, I divorce. If I say these 3 words it would dissolve our marriage so don't say that again and again especially over the phone when you can't predict the other person's mental state and this can destroy our marriage, so don't ask for it again'. 

So my question is, does divorce take place by saying this because he was just explaining, without any pause, that I shouldn't ask for it again and again.