No mailer may be reimbursed for any amount paid under any rate or fee which, after such payment, is determined to have been unlawful after proceedings in accordance with the provisions of sections 3662 through 3664 of this title, or is superseded by a lower rate or fee established under subchapter II of this chapter. ( Pub. L. 91–375 , Aug. 12, 1970 , 84 Stat. 764 ; Pub. L. 109–435, title X, § 1010(a) , Dec. 20, 2006 , 120 Stat. 3261 .) Editorial Notes Amendments 2006— Pub. L. 109–435 substituted “sections 3662 through 3664” for “section 3628”. Statutory Notes and Related Subsidiaries Effective Date Section effective Jan. 20, 1971 , pursuant to Resolution No. 71–10 of the Board of Governors. See section 15(a) of Pub. L. 91–375 , set out as a note preceding section 101 of this title .