If the opportunity to appeal the determination has not previously been provided under part 24 or 780 of this title or any other appeal procedure, a debtor may obtain an administrative review under part 780 of this title, or other applicable appeal procedures, of CCC's determination concerning the existence or amount of a debt, if a request is filed with the authority who made the determination within 15 days of the date of CCC's initial demand letter, unless a longer period is specified in the initial demand letter.