I lost all my RP from a previous game.

At approximately 14:15 (GMT+7), me and my trio all got booted from a game we queed into because of an apparent anti cheat reason. Due to this, when I re-entered my lobby i realised i had gone from 400RP in diamond to 238RP, I had lost all my points from the game before getting kicked. I believe this is unfair. 

PC player.