My DS (12) plays on Clash of Clans all the time. Occasionally, he will ask to spend some of his own money on piles of gems and that's fine. I've just had a bill from iTunes for over £100 for gems. Anyone had any luck trying to get anything back from Supercell who run the game. I know it's a long shot if he's bought them (not been able to speak to him yet) but it's £100!!