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If the attorney violated the standard of care and you can prove those violations caused you financial harm, you may have a malpractice case. ...

The new attorney can start right away. The former attorney is required to promptly sign and return the document. Your attorney can file a motion...

No an attorney may not do what you indicated. It is a crime, an ethics violation, and malpractice if you were harmed.

You have a right to replace your attorney. Consult with other attorneys before firing your attorney.

If it is on their property, you can do nothing. If it is on public property, contact the city to complain.

In most states, you simply serve the interrogatories without the need for a motion.

You contact the deposition officer (the company who handled the records) and you purchase from them. This is the typical way, but expensive....

The Answer is here: https://selfhelp.nvcourts.gov/faq/questions-about-serving-legal-papers?enter=1

See California Code of Civi Procedure 345. The statute of limitations is the same for all contracts.