In any trial, hearing or proceeding to determine a violation of this article a written statement signed by the person for whom any purchase is financed, to whom any money is loaned or for whom any extension, renewal or other act in connection with a loan is to be granted or performed, declaring that such person voluntarily chooses the insurance agent or broker through whom the insurance or its renewal was transacted, and that the choice of such insurance agent, or broker was not made a condition precedent to such purchase, loan, extension, renewal or other act shall be prima facie evidence that no violation of Section 770 has occurred, if the borrower or purchaser in his own handwriting shall have written the name of his chosen insurance agent or broker into an authorization of such insurance agent or broker.