Am I wrong to demand being paid by ex?

November 6, 2015

I have two children aged 7 and one to ex partner. We split 4 months and he was giving me 50 each week. He has suddenly stopped it saying that he will buy them stuff when he has them. He works 30 hours or more a week and earns 250 pound each week. I am on income support and receive child tax credit. Am I wrong to demand the money.