“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 3, no. (1) (January 31, 2014): 50–76. Accessed June 30, 2026. http://www.singaporeanjbem.com/index.php/SJBEM/article/view/107.