How to report a player to Microsoft

I recently had an encounter with a group of people who were making sexist insults, using racial slurs, threatening violence, telling me to "kys" over and over again, and various other derogatory things. I have screenshots of some of their harassment (the worst of it was over voice chat though). They repeatedly invited me to their party to say horrible things and I only joined to gather the evidence for a solid report... and they would spam party invites to me any time I left their party. The last time I left their party (after 2 hours of toxic behavior) they literally sent me 20 party invites in a row. Obviously, I blocked them at this point, so I know I'll never have to deal with them again. The next day they continued to send invites to my husband until he blocked them too. I already reported them to the company of the game we were playing and to Xbox and I'm waiting for action through those avenues. I've been told that there is also a way to report them directly to Microsoft, but I am having a difficult time finding that option. (The things they said and sent to me were so much worse than what I described here so I don't want to just block them and move on while they have the freedom to go around treating other people like this.)

:)