You should contact an attorney skilled in this area of law as soon as possible. From the facts you have given, it sounds like you can challenge personal jurisdiction. However, even if you weren't served properly, you are now on notice, so you need to act quickly. If you do a motion or Order to show cause properly, your case could be dismissed for lack of personal jurisdiction, without the need of a traverse hearing. It depends on several other factors that your attorney would want to know about.
How does the process server claim to have made service? Unless it's nail and mail the process server didn't have to make more than one attempt.
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I would have a number of questions (like the other attorneys trying to answer your inquiry). That said, service of process could have made on the party but an acceptable alternative is service on a person of suitable age and discretion. Good luck in resolving this situation.
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If you want to challenge that service was proper, you should move to dismiss on the basis of lack of personal jurisdiction. Be sure to provide lots of specific information so that it is not just a bald denial of in proper service. Your question indicates that you are willing to dig a little bit deeper into the matter, so I would suggest you do so and make sure you provide all of the facts that would entitle you to a traverse hearing and that you specifically request one as an alternative relief to dismissal.
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