What do I do if my ex-husband perjured himself on his financial declaration re ch sup? re unempl but claim wk?

He is trying to take custody and have me now pay him child support. In order to look more stable, he claims he's working and rec'vg a large sum of money but he's been on unemployment for 8 months, I know this to be true because his unemployment is being garnished weekly to pay me my child suppor. Also, his church put him up in free housing when he lost his job 8 months back but he's claiming he pays 700.00 a month in rent, the church denies this but refuses to get involved. He also claims he pays 300.00 a month is childcare when he's NEVER taken the kids to a sitter in his life. I want the court to recognize he's a liar, I want the entire motion dismissed because he's a liar! oh, please help, getting no advise from my lawyer.