Friend's Account Compromised, what should be done?

[Austanley]

Hello. My friend's account has been compromised by the use of a mod with content that was less than friendly. They dumped all of the valuable content on the profile into the void before leaving the co-op. My friend has tried changing their password as well as their name. The person who has stolen the account has been able to continue to log into his Minecraft account and thusly his Hypixel account. What should be done at this point? Thanks.

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