Final answer:
The most useful feedback message for the feedback receiver would be: "That was a good call. Don't forget the last step in customer service though. Follow up with our HR customers to explain the status of an issue."
Step-by-step explanation:
The most useful feedback message for the feedback receiver would be: "That was a good call. Don't forget the last step in customer service though. Follow up with our HR customers to explain the status of an issue." This feedback message acknowledges the positive aspect of the call, while also highlighting a specific area for improvement. It provides clear guidance on what the feedback receiver should focus on next.