File a complaint against the user and do NOT make any further contact with them in chat, messages, and in-game if applicable.... Although your story sounds kind of shady. Why would you be in a party chat of someone who's DDoS'ing you? (Unless they invited
themselves in with someone else....idk) ......Anyways, if the "attacks" persist, call your ISP to get a new IP address and if necessary, call your local police for help as DDoS'ing or IP flooding is illegal.
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