An organization's customers have historically been satisfied with the functionality and performance of its service.

The best way for the organization to collect the information needed to address the complaints is to collect customer experience and service level metrics. Customerexperience metrics are measures of how customers perceive the quality and value of the service and the interactions they have with the service provider. Service level metrics are measures of how well the service meets the agreed requirements and expectations of the customers and users. By collecting both types of metrics, the organization can identify the gaps and issues in the service delivery and the customer journey, and take actions to improve them. Some examples of customer experience metrics are customer satisfaction, net promoter score, customer effort score, and customer loyalty. Some examples of service level metrics are availability, reliability, performance, and incident resolution time. References:https://www.axelos.com/resource-hub/blog/itil-4-leads-to-value

https://www.genroe.com/blog/what-is-the-role-of-customer-feedback-in-the-itil-framework/861