In recent years, marketing has become the bedrock of business; equally customer satisfaction has grown in importance in all commercial organisations. The study interrogated the effectiveness of good customer service in the modern day and competitive business dealings. The study is descriptive in nature relying mainly on secondary source of data collection and analysis. The work found customer loyalty, positive relationship with increased profit, higher inventory turnover of the organisation, personal satisfaction and fulfillment of customers, and higher morale of employee as the effect of good customer service. However, effectiveness of customer service is been defied by a number of barriers, namely negative first impression, dichotomy, superior-subordinate relationships, non-caring culture and lack of adequate training among others. The work concluded that customer satisfaction has become a crucial factor in determining the accomplishment of a business organisation in the contemporary and competitive corporate world. The study recommended good first impression, team work, cordial relationship between senior and junior staff, staff motivation, and prioritise train and retrain of staff.