I'm about to send a PM to the manager so he doesn't pay him for that post.
What do you think about this?
You do not need to message his manager for now. This is very common on this forum. Just start to be checking the first page, you will see other posts that will be saying what others have posted in the beginning of a thread. You can first message them and warn them. If they do not accept warning or still doing like that, then you can report the person to his campaign manager.
Send a pm to such member sound most appropriate to me, but while at that, it is important to also make use of the report to moderators features, since such a comment is regarded as repeatation and could drain the thread and put us off the main topic of decisions.
So having it deleted by the moderator and warning the member through pm will help stop future occurrence of such posting patterns.