How you do you stop a spamming chess player on chess.com from messaging you?

I joined this chaps online chess tourney, he then sends me constant inboxes for tourneys, I told the guy I can't join more then one as i'm not a paying member... He never replied, the following day I had 7 inboxes for 7 different tourneys. I dropped him a not kindly asking him to stop sending me frequent daily tourney invites, he deleted the post and sent me 2 day...  It's prob a group setting I need to edit but not sure!! Thanks.