It doesn't looks like that happened in a game. If it happened in a club, talk to the club admins.
https://support.chess.com/article/628-how-can-i-block-another-user
A 100 ELO MESSAGED ME THIS LIUSGUSFG S^F&(^RV( SR%S(&^O*I STN^&FRS%&(D $^X &‡flÎfiÍ·fi‡flØ^
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[image of chat removed- jbf]
/ Don't make accusations in the forum. Report the player by clicking the report button on their profile.