Apple Id deactivated due security reasons

Need help urgently. Current Apple ID password not valid. I try to go iForgot mode n key in my Apple ID but it says my Apple ID is not valid. And now i cant even sign in or out without my password. 1st Apple ID password wrong. 2nd when try to reset password its says my APPLE ID is not found. Now i had been getting itritating notification to type in my Apple password. how do i solve tis problem.