Whenever interest received or contracted to be received by the lender on a revolving credit as defined in Section 4.1 hereof is lawful only under the provisions of Section 4.2 hereof, no provision contained in any contract or agreement respecting a revolving credit or in any draft, item, order for the payment of money, evidence of debt or similar written instruments which is used in connection with such revolving credit shall be enforceable, which
815 ILCS 205/4.3