California Code, Insurance Code - INS § 12977

(a) Where the receipt or collection has resulted in an overpayment or duplicate payment.

(b) In cases where no payment is required for filing the application for the license, permit or certificate sought, or for rendering the other service.

(c) Where an insufficient fee is paid and for which reason the application for the license, permit or certificate cannot be filed or the other service cannot be rendered.

(d) The penalty fee required by subdivision (b) of Section 1718 upon a written showing, filed within sixty (60) days after the delinquency date, with particularity as to facts that late payment resulted from mistake, inadvertence or excusable neglect.

This section does not exclude the making of refunds under other appropriate provisions of law requiring the approval of the Director of General Services before such refunds may be made.