Cal. MVC § 409.15

(a) Any person who receives a good faith request from a service member for relief pursuant to this chapter and who believes the request is incomplete or otherwise not legally sufficient, or that the service member is not entitled to the relief requested, shall, within 30 days of the request, provide the service member with a written response acknowledging the request, setting forth the person’s basis for believing or asserting that the request is incomplete or not legally sufficient, or that the service member is not entitled to the relief requested. The response shall clearly identify the specific information or materials that are missing from the request and that would be required to grant the relief requested, and provide contact information, including a mailing address and telephone number, which the service member can use to contact the person.

(b) If the person fails to make such a response in the timeframe set forth in this section, the person waives any objection to the request, and the service member shall be entitled to the relief requested.