grievance
https://www.chess.com/forum/view/community/report-abuse-and-annoyance-button
Please report to support https://support.chess.com/customer/portal/emails/new
As mentioned, you can write to Support (#6) or use the report button (#2)
You can access the report button within a game (mainly for abuse of suspected cheating) - or anywhere else- by clicking the offender's name and choosing the report button from the list of options:

Thank you guys. I file a complaint. Because I was winning the guy said to me that he can't believe a poor black slave guy from a poor African country can play and even asked if I'm for sale. I ignored him and finished the game. after the game he won't on to insult me further in my inbox. Never responded to him. I only want to improve my game. That's why I am here
If you need help, please contact our Help and Support team.