This assignment aims to investigate the effectiveness of customer service delivered by Marks and Spencer (M&S). The study will collect information from both primary and secondary sources. Primary data will be gathered through questionnaires, while secondary data will be collected from books, journals, and online articles related to the topic. A sample size of 50 customers of M&S will be selected using random sampling. The objectives of the study include determining whether customers are delivered appropriate service by M&S, identifying factors that contribute to customer satisfaction and loyalty, and exploring the impact of customer service on customer retention. Overall, this study aims to provide valuable insights for M&S to improve its customer service and retain existing customers.