Lost access permission to my cloudflare issued domain

I bought domain from cloudflare. And few days ago, all of my cloudflare account data has been deleted (DNS, Websites, Workers, etc. I don't know the reaon yet.) When I checked what happened, nameserver was changed. So I changed nameserver of non-cloudflare domains. But nameserver of cloudflare-domains could only be changed in cloudflare. So actually I can not handle it. LOST PERMISSION. Additionally, my account is experiencing some errors, such as "User is invalid" error. Even I can log in to console, I can not get into Support Center. Login -> Support Center -> "User is invalid" & Automatically logged out -> Relogin again and again. I think Cloudflare's Database is something wrong, because few years ago, I changed email of cloudflare account from [email protected] to [email protected], but as I can see in that error code, it shows previous email account that is now not available.