Within 30 days following the service of the Notice of Intention to Fine (which period the district director or the Associate Commissioner for Examinations, or the Director for the National Fines Office may extend for an additional period of 30 days upon good cause being shown), any person upon whom a notice under this part has been served may file with the district director or the Associate Commissioner for Examinations, or the Director for the National Fines Office a written defense, in duplicate, under oath setting forth the reasons why a fine should not be imposed, or if imposed, why it should be mitigated or remitted if permitted by the Immigration and Nationality Act, and stating whether a personal appearance is desired. Documentary evidence shall be submitted in support of such defense and a brief may be submitted in support of any argument made. If a personal interview is requested, the evidence in opposition to the imposition of the fine and in support of the request for mitigation or remission may be presented at such interview. An interview shall be conducted if requested by the party as provided hereinabove or, if directed at any time by the Board, the Commissioner, or the district director or the Associate Commissioner for Examinations, or the Director for the National Fines Office.