There isn't anything you can do. If they are having him pay (you say @ $400/month), then that's all there will be. The law requires him to pay, but it puts a cap on how much of his pay can be taken for support. Working in construction, his pay is probably hit-and-miss at best, but you don't explain why they cannot garnish his pay? Is he self-employed? Regardless, the state has an order and is enforcing it, so there isn't anything you can do about it. The lack of contact with the kids is irrelevant - you can't change that.
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