You're right about one thing: " . . .neither state is doing anything." The time has come to hire an attorney for enforcement. Many will handle support enforcement on a contingency basis, but you'll have to either have a lot of info on his income / assets; or pony up enough money to allow an attorney to do some discovery -- like pull a credit report or search for bank accounts, assets, and employers. Arrest warrants and D/L suspensions are part of the process.
Make some calls.
See my answer in your other thread.
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