If your email and password are changed on the account then there is no way to recover the account. This company has a very strict policy with recovering accounts and if anything is different then you cannot recover the account. You must have the original email or phone number on the account.
The issue and preferred resolution, in GetHuman-maocabun's own words:
It got hacked before im changing my avatar and after that i got hacked so i want my roblox account back
I trust that ROBLOX will make this right and come up with a resolution that is fair.
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