How to report people cause of bot ?

[KageTokage]

In all honesty, I wouldn't be too sure those guys were even using bots. They could've just been trolls (The healer not having a job equipped is a good indicator, and in all seriousness, you shouldn't even be allowed to queue for dungeons past 30 as a class).

If you did want to try reporting them, supposedly the best method of doing this is going to the Lodestone main page, click help and support in the top right, then click "Report Offending Players" in the bottom right on the following page.

The support team has proven itself to be notoriously inept at actually doing anything about cheaters, though, so you'd almost certainly be wasting your time. I've reported the same few gathering bots on my server about six times over the course of a year and they're still around.