There is no indication in the facts presented of a valid lawsuit. But Consult with experienced attorneys in the state where this occurred.

Yes you can sue this lawyer in the United States.

If you received the benefit of the utility, yes they can likely force you to pay. You would be able to sue the ex.

While a technical violation, if both payments were made by the lump sum due date it should not be an issue.

Collection agencies would be of limited value. Some attorneys collect judgments on a contingent attorney fee basis. Sometimes obtaining and...

No a judge cannot order payments. The creditor must go after the assets. The only reason to record the judgment is to give notice to any purchaser...

The attorney may be acting wrongly. Consult with experienced legal malpractice specialist attorneys in the state where this occurred.

You cannot trust this unless it is in writing. Filing an admission is probably not in your best interests.

Consult with experienced HOA attorneys in the state where this occurred.

As you were levied they have a judgment. If you had not received notice of the lawsuit, look into filing a motion to set aside the judgment.