Try Minecraft support:
https://help.minecraft.net/hc/en-us/articles/27201635294861-Troubleshooting-Minecraft-Sign-in-Issues
https://help.minecraft.net/hc/en-us/request/new?ticket_form_id=360001225811
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I have a Minecraft account, but I got logged out. When I try to log back in and enter the email address I know for a fact is correct, it tells me the account doesn't exist, so now I can't play on my account.
There’s no issue with how I typed the email address; it simply says the username doesn't exist. It’s strange, though, because I’ve been logged out before and was able to log back in using this same email—yet now it says it doesn't exist.