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Calling others may be a violation of law. Otherwise, they have a right to call when late. Even where rudeness is not warranted, some people are.

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

Even if legitimate, all they can do is sue. Have them put their proof in writing.

Service for mailbox store addresses is addressed in California Code, Code of Civil Procedure CCP § 415.20

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Maximum 33% of total for fees, plus costs.

It is not likely a viable case. To confirm, contact malpractice attorneys in the state where this occurred. ...