For quick reference here are their contact information:
Prime Minister’s Office (PMO)
Prime Minister’s Office, Taufa’ahau Rd, Kolofo’ou, Tongatapu
Postal Address: P.O. Box 62, Nuku’alofa, Tonga.
Tel: +(676) 24-644 | Fax: +(676) 23-888 | Web: http://www.pmo.gov.to | Email: pressoffice@pmo.gov.to