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You could try to call the police, but they likely would just tell you this is a civil matter again and to take it up in court. So I hate to say it, but I think you are stuck here and can either meet him halfway or let him keep your son and when he misses school tomorrow if the father doesn't take him, that gives you even stronger grounds to file a motion for contempt of court.
With that said, this clearly looks like retaliation for the support increase and the missed visitation and a judge should see it that way as well.
I am sorry that you don't have more options...
Well, yes, that could go along with any motion for contempt that you filed. And it would be up to the judge to determine if his behavior was bad enough to take away his custodial rights...
It will likely increase your chances of getting him held in contempt, but to be honest, if the judge does hold him in contempt, he will likely give him a slap on the wrist because that is how these things go.. If he violates the order again, the penalties get more severe..