First click the forgotten password link on the roblox website. Like and subscribe im showing you how to get your account back.
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If your account got deleted then there is not way to come back.
how to reactivate roblox account after ban, Create a different account and behave. It has been banned for 1 day and it was gonna get reactivated today but its passed the time and it dosent say the reactivate thing. You must wait out the ban time. If you are permanently banned your account is lost forever otherwise the ban will lift within a week. If your account got deleted then there is not way to come back.