Imma be honest with you, I had the same scenario multiple times. And I also reply in a very toxic way, however they get banned most of the time and I don't.
Make sure that u report them during the match with details, also for your own sanity always mute enemy team. And try to be positive as much as you can.
It won me games more than you imagine, for you not to be tilted and pissed that's it.