Reports on trolls/feeders

Has anyone gotten messages saying a person you have reported has been punished? I have reported people who literally just trolled and fed, and I reported them and nothing happened. I have not got any message. I decided to play an aram, and the other team got an amumu, they all said he was trolling and even he acknowledged it. He would run out and die, respawn run out and die again. Not only that but he decided to buy 6 tears if that isn't troll then what is. Then he sold those and bought 6 different boots... come on now. At the very end he sold his items to make it look like a regular build. Now if I am not going to get a warning telling me to stop trolling whats stopping me from doing it? If no one gets punished, what's stopping anyone. If I get mad and start trolling nothing is stopping me.