Assertive confrontation message

Read the following situation and prepare an assertive confrontation message and tell us what points you will use in your message. Why did you choose these points for your message?

Manuel has become a broken record. For weeks, he has come into your office to complain about something. Often, his complaints have to do with the way his co-workers are performing. Sometimes, he complains about a specific co-worker and subtly implies how superior his performance is to the co-worker. He then suggests how underpaid he is. Occasionally, he has even threatened to quit and find a better position elsewhere. Manuel is a good performer, but on average no better or worse than his co-workers. You would like to pay everyone more, but budget and market considerations don’t allow it. Also, you do not feel additional pay is warranted for Manuel in comparison to his co-workers. Also, you want the complaining to stop.