... But I see here they are talking about sending email with your account mail. So what is the problem here? If you are the original owner of the account, then sending the information to this email can solve your problem.
You really didn't see the explanation written by @Kirito89 before your post?
I read that reply. And this reply has no connection with that reply. Because OP was instructed by the support team to email the information, and I gave him the email advice based on that. Maybe you didn't see the screenshot of the support team message that the OP added here before replying.
In OP's case, it's simply a case of a 3d party person claiming a high roller account belongs to him, even though OP can not provide any evidence to support the claim, no ip, no previously used adresses, no access to account email , heck he couldn't even name the email address that was linked to the High roller account.