Cal. Civ. Code § 1788.16

It is unlawful, with respect to attempted collection of a covered debt, for a debt collector, creditor, or an attorney to send a communication that simulates legal or judicial process or that gives the appearance of being authorized, issued, or approved by a governmental agency or attorney when it is not. Any violation of the provisions of this section is a misdemeanor punishable by imprisonment in the county jail not exceeding six months, or by a fine not exceeding two thousand five hundred dollars ($2,500) or by both.