You can report such players by contacting support. But before you do, it might be a good idea to explain the situation on the forums (in Tech Support) first, without mentioning the player's name. Most of the time, people mistakenly report players because they do not understand the game mechanics.
Don't you worry about that. If I wanted to mention fingers and point names I would have done so in my post. I deliberately coined it 'suspected player cheating'. For it could be nothing and it could be something. I sent a report to support explaining the issue. I don't want to set forums on fire or anything.