Order What Court Order Would A Collections Agency File And What If It's Undeliverable?

What court order would a collections agency file and what if it's undeliverable? - order

In the U.S. state of California, if a person in debt to the creditor and liabilities were transferred to a collection agency, if they would ask the collection agent to a court order and it would be? And they could not deliver the court order? As the court to be removed before they have to appear?