report them for throwing.
let me clarify this:
A smurf/booster can be a person who made a second that he keeps by manipulating the match maker system (by hard throwing, soft throwing, or not trying at all) to stay in a low rank
report these people by saying “throwing games” in gameplay sabotage if they admit to being a smurf or if you are fully sure they are smurf with your team. I got over the last month many thank you for your report screen for reporting smurfs/boosters. sometimes i didnt get those screens on people i thought were smurfs because guess what they werent. easy as that the system will check the account and do whats right. if you want to help contribute rather than crying about it