"If you forgot the answers to your Apple ID security questions" click here --> https://support.apple.com/HT201485
If you see the message, "not enough information" read this link:
Security and your Apple ID - https://support.apple.com/HT201303
"Without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account."
With that in consideration, if the online option does not resolve the problem I suggest trying to get a personalized response with a chat or telephone call. To talk by telephone: Contact Apple for support and service - Apple Support --> https://support.apple.com/HT201232
For other support options including those if your country does not have telephone support: https://support.apple.com/choose-country-region To chat, choose any topic, (not Apple ID) continue working your way down options until you find one with chat support, then ask to be redirected.
(Note: If your country is not listed, there may be a support option at the end of each region section for "other".)
If none of those work, fill out this form. Hopefully it will be redirected to somebody who can assist you. iTunes and App Stores support --> https://support.apple.com/en-euro/itunes-contact
Apple is insistently encouraging users to use Two Factor Authentication instead of security questions. --> https://support.apple.com/HT204915