Who gets characters

Yesterday happened a fact that starts to come out that a member of my alliance got a ronan of 4 * look at ronan and it was doubled by 5, and it caught my attention because they roar wins in labyrinth and reign of legend, discard Kingdom as it gives cyclope, rhino and rum together. After that it appears that one member of the alliance won a cyclops of 4 * and also doubled by 5 so I took out by discard that they had passed labyrinth, my alliance is not powerful to pass labyrinth average power is 150,000, we all have very few heroes 5 *, so the most logical reason that they used a hack, I do not want my alliance to be harmed, so I ask you to say who gets a character to see if he got it in a legal or fraudulent way, in order to be expelled from the alliance
I hope you hear my request thank you very much