(1) A person may apply to the Secretary for external review of a determination made for the person under section 17 that is:
(a) made on an internal review under subsection 23 (3) (internal review at Secretary's initiative); or
(b) a determination made or affirmed on an internal review under subsection 24 (6) (internal review on application).
(2) If the determination was included in an offer, the application must be made before:
(a) the end of the acceptance period; and
(b) the offer is accepted.
(3) If the determination was included in a refusal, the application must be made before the end of the 21 day period starting on the date of the refusal, or that period as extended under section 22 .
(4) The application m ust be made by:
(a) sending or delivering a written application to the Secretary in accordance with the rules (if any) ; or
(b) making an oral application, in person or by telephone or other means, to the Secretary in accordance with the rules (if any) .
(5) If a person makes an oral application in accordance with paragraph ( 4)(b), the person receiving the oral application must:
(a) make a written record of the details of the application; and
(b) note on the record the day the application is made.