yes, I use it, but I am logged out from all my devices and I can't log in, maybe it is possible to show this problem in person with photos, where is my account information?
It's quite rare. Jagex would only do this if they are certain you are not the owner of the character. I am assuming the true owner has contacted Jagex and provided enough proof to claim the character back.
how is this possible if I do everything with the account? I have access, I can change my password, it can be changed, I get access to the email I used to create the account, it's mine