AN EVALUATION OF CUSTOMER SERVICE AND THE IMPACT OF EFFICIENCY ON NAMIBIA’S LOGISTICAL SECTOR: A STUDY INVOLVING SELECTED COURIER COMPANIES. Singaporean Journal of Business Economics and Management, [S. l.], v. 3, n. (6), p. 1–38, 2015. Disponível em: https://singaporeanjbem.com/index.php/SJBEM/article/view/248. Acesso em: 27 jun. 2026.