Go to the court and get a copy of the file. Look at the affidavit of service to see if it is accurate. If it is not accurate, then you can make a motion to vacate if service wad not proper and you have a defense to the allegations.
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Your immigration status is irrelevent. The issue is whether there was jurisdiction over you. Go to the court and review the affidavit of service in the court file to see how they claimed you were served. If you did not reside at the place when they say you were served you can file an Order To Show Cause to vacate the default judgment and to dismiss the case because it is now beyond the 6 year statute of limitations.
I am a former federal and State prosecutor and now handle criminal defense and personal injury/civil rights cases. Feel free to check out my web site and contact me at (212) 577-9797 or via email at Eric@RothsteinLawNY.com. I was named to the Super Lawyers list as one of the top attorneys in New York for 2012. No more than 5 percent of the lawyers in the state are selected by Super Lawyers. The above answer is for informational purposes only and not meant as legal advice.