Can someone please help me take action

Hello people of xbox. There's this guy on my friends list from the xbox 360, I haven't talked to him or even received a message from him since the 360. He just out of the blue joined my party and started calling me and my friends the N-word. I'm not ok with people saying that in my presence, especially since my mom is black. Everytime I report someone for saying stuff in a party they never get banned. This time I'm not just going to let it go and block them, action needs to be taken. Multiple people can back up my story if need be. He's done it twice now in the past 2 days.

Sincerely

Ps. I'm not posting his gamertag, but if a Microsoft employee or someone who can take action contacts me I will definitely give you any information you need.

:)