(815 ILCS 205/4.3) (from Ch. 17, par. 6409)
    Sec. 4.3. 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
    (i) provides that in the absence of debtor's breach or default the lender may arbitrarily and without reasonable cause accelerate the maturity of any amount or part owing thereunder;
    (ii) purports to waive any provisions of this Act; or
    (iii) provides for any amount to be added to the account each month for the privilege of having the revolving credit account provided there is no unpaid balance at that time.
(Source: P.A. 83-944.)