Before the judge can do anything, he has to have proof of service. If you don't have it you can request an adjournment to get it. If you have it and you ex doesn't appear, the support magistrate can request a warrent for his arrest. Due to the fact that you have filed for a violation in addition to an upward modification, it is unlikely the court will do anything until the responsent has actually come to court at least once. You should get an attorney to help with the proceedings. The court can grant counsel fees to you on the violation.
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This advice is not meant to create an attorney-client relationship and is a general anwer to the question posed.
the Judge will not continue the case without you providing proof that the other party was served... you will have to bring proof of service, if you do not have it and you have been to court multiple times without it the Judge may dismiss the case, if its on for the first time and you do not have the proof then the Judge will likely just give you more time to complete service...
technically until service is completed and the Court is provided with proof of that service, the Court does not have jurisdiction to hear a case... as such, there would be no way to get a decision in your favor without proof he knew about the case, by a an affidavit of service