So here is a tutorial, how you block people you think who are hacking, and report them:
!!Attention: You never play with them again, but you can remove them from the list!!
First Step:
You open your overlay, and then you klick on "View Players" :
Hidden content:
Then you klick on "previous matches" and then you search the player and klick on: Profile:
Hidden content:
Now you are on his profile! Klick then on "Block all communication",
Hidden content:
Hidden content:
When you finished the third step, you only have to klick on: "Report Violation" and then on: "Suspected Cheater".
Hidden content:
I hope this turorial is gonna help you in near future.