STRATEGIES TO REDUCE CUSTOMER COMPLAINTS AT A TELEPHONE SERVICE PROVIDER IN THE KINSHASA REGION, DEMOCRATIC REPUBLIC OF CONGO. Singaporean Journal of Business Economics and Management, [S. l.], v. 3, n. (1), p. 50–76, 2014. Disponível em: http://www.singaporeanjbem.com/index.php/SJBEM/article/view/107. Acesso em: 30 jun. 2026.