In the lawsuit to discovery to demand that information. If they fail to provide you may win your case.

Yes you can attempt settlement. The attorney might respond to you. Put your offers in writing.

Look at the court file (some records are online). Look into a motion to set aside the judgment for failure to lawfully serve the lawsuit.

It may be a scam. Whenever one is unsure, give no information, demand proof in writing (do not give your address or other information),...

You must respond in the legal way and on time with, for example a motion or an answer with affirmative defenses. Failure to do so could result...

The opposing attorney may not contact you but is not prohibited from contacting others.

On proper proof it is possible the attorney actions could be considered ethical violations. See California Business and Professions Code § 6106:...

This may or may not have occurred due to malpractice. Malpractice means that a health care provider violated the standard of care. A bad outcome...

This could have occurred with or without malpractice. Malpractice means that a health care provider violated the standard of care. A bad outcome...

It is unlikely any case would still be viable.