I need some help with roman mercenaries

[Timus]

In Caesar's civil war, around the time of the battle of Dyrrachium, there is an interesting bit about 2 Gallic cavalry (not quite mercenary, not quite regular auxiliary just yet) commanders that were pocketing money from "ghosts" soldiers they'd keep on the role. At some point, they got afraid enough of getting caught to switch sides and provide valuable intel to Pompey.

There might be better examples in Carthage's military history because of their (apparent ?) bigger reliance on mercenaries. Afterall they had to quell a pretty big mercenary revolt at one point.