reset sequrity question

Read these links please:

About Apple ID security questions - "Learn about Apple ID security questions, including how to set up or change your questions." - https://support.apple.com/HT201363

If you forgot the answers to your Apple ID security questions - 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 try the general support link. I suggest trying to get a personalized response from a chat or telephone call. To do this, choose any topic, continue working your way down options until you get the desired form of contact, then ask to be redirected.

Contact Apple for support and service - Apple Support --> https://support.apple.com/HT201232

Apple is encouraging users to use Two Factor Authentication instead of security questions. --> https://support.apple.com/HT204915

You need to contact Apple Support using the link Limnos posted.

fill out and submit this form.          The form is for iTunes, but it will get passed to the ID Support section.  

Yes, you need to contact Apple just like I said 6 hours ago in the very first reply. You did read that didn't you? No?