Within 30 days after notice of cancellation from the insured, a private mortgage insurer or mortgage guaranty insurer shall, if the policy is cancellable, refund the remaining portion of the unused premium to the person or persons designated by the insured.
Source:
Section 2954.65, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=2954.65..