If the judgment is in Minnesota I suggest you re-post your question on the Minnesota Avvo page.
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I think you need to prioritize your issues. If you have a judgment out there against you that shouldn't be, your energy and resources need to be focused on that issue, not who you can sue. You can sue people once you clean up the underlying problem.
First, verify the existence of the judgment. Contact the court where the judgment was supposedly entered and obtain a copy of the court file (this would likely be the county court where the property was located). In addition, in the court file, you will want to find the affidavit or proof of service. That document will tell you how you were allegedly served with the summons and complaint.
A word of caution, and I can't speak for MN law, but the CC&R's (HOA rules and regulations) can be and often are a separate agreement. "Residents" in an HOA can be bound to the CC&R's even if the resident is not on deed to the underlying property. So, the judgment could be valid...or, at least it is possible. But, as I said, first do some leg work to gather the necessary information to even figure out the next move.
Then contact an attorney in MN to figure out your next step.
You should contact a lawyer in Minnesota to vacate the judgment as it was likely defective.
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Find a Minnesota attorney to vacate the judgment. After that is accomplished the phone calls and collection activity could be addressed.
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