154 Telecommunications Act 2005 2005, No.20 limited to a prosecution for an offence, a certificate signed by or on behalf of the Regulator and stating: (a) that on any date a person was or was not the holder of a licence issued pursuant to the Act; (b) that on any date the Regulator had made or otherwise issued or amended or revoked or cancelled a rule, order, licence, direction, guideline or other act of authority under this Act; (c) the content of a rule, order, licence, direction, guideline or other act of authority made or otherwise issued or amended or revoked or cancelled by the Regulator under this Act, shall be sufficient evidence of the facts stated in the certificate and such certificate shall be presumed to be so signed unless the contrary is proved. 83. Service of Notices etc-(1) Where under this Act a notice, order, letter, other document or act of authority is required or permitted to be served on any person, the notice, order, letter, other document or act of authority may be served: (a) In the case of service on the Regulator; by (i) delivering the notice, order, letter, other document or act of authority to the Office of the Regulator during normal business hours; or (ii) sending the notice, order, letter, other document or act of authority by pre-paid post or facsimile transmission to the postal address or facsimile address, as the case may require, of the Office of the Regulator; and (b) In the case of service on any other person, by: (i) delivering the notice, order, letter, other document or act of authority to the person at the nominated address in Samoa of the person in any application made by the person to the Regulator or to the nominated address in Samoa of the person in any licence or other act of authority affecting the person