Reporting threats and offensive users.

I have just had to sit and read a bunch of chat, from 3 individuals on Rocket League telling me and a friend to get cancer, to die, that they were going to bomb our houses, shoot our family members and a whole host of other insults. The 3 of them, then proceeded
to join a party i was in. One of them said he was 12 year old, at which point he was asked to leave the party immediately. He then told us in depth about his plans to ____ our _____ mother and his friend, who thought this whole thing was hilarious starting
chiming in with some equally appalling filth. I tried removing and blocking said individuals but they kept inviting each other back in, i had to leave the party and start a new one and put it on invite only. I have tried numerous ways to contact Microsoft
to talk to someone, and get something done about this. I am a grown man, what if these children were in a party with other children? It has no place on xbox and something must be done, there are far too many of these toxic people online who think they have
the right to say anything they like, to whoever they like. I have already reported them, and left comments to inform whoever reads it of what happened but xbox has to do better. Does anyone know of a phone number or an email address of someone i can contact
regarding this? This abhorrent behaviour must be punished.

Thanks in advance to anyone who can help.

:)