What you need to do is file a complaint on this individual using the tools on your console, then set them as an avoided player and block communications with them.
This person will not be able to bother you again and the XBLPET (LIVE police) will take it from there.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.