How do i contact janus henderson customer service? Call A Janus Henderson Representative 800.525.3713 Weekdays, 9 a.m. - 6 p.m. ET For 24-Hour Automated AssistanceHow do i contact the henderson group? If you wish to speak with a member of the Henderson Group team, please contact reception on: Tel: +44 (0) 28 9034 2733.How do i contact the henderson family care clinic? Email address: [email protected]. Henderson Family Care Clinic. 1621 Front Street. Henderson, NE 68371. Phone: (402) 723-4512 Fax: (402) 723-4520.