Forgot security answer

contact Apple ID Support. See the Apple Support articles below for contact information.  

Apple ID - Official Apple Support.    

Contact Apple for help with Apple ID account security - Apple Support.   (Link doesn’t always load)  

Get Support          Work through the screens to get a chat option. 

https://twitter.com/AppleSupport

From the Apple Support article below. 

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. These policies are audited and reviewed on a regular basis.

Security and your Apple ID - Apple Support.      

I understand your frustration. You say you have your Apple ID/Password. Are you unable to sign in at Apple ID: Your Account for Everything Apple https://appleid.apple.com/#!&page=signin to reset your security questions? If not then, that is your main problem. Also, I said above "if you want to contact Apple support to discuss an extenuating circumstance, see these support options: You still can do so even if you don't have one of the example extenuating circumstances I posted. Good luck. Be safe.

See If you forgot the answers to your Apple ID security questions https://support.apple.com/en-us/HT201485

Apple has told you: "We do not have sufficient information to reset your security questions." So see: 

Security and your Apple ID https://support.apple.com/en-us/HT201303 This document says “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.”

Thus, given that you are unable to answer your security questions successfully, we can do nothing to help you, except to mention that Apple support might help you if you have an extenuating circumstance (e.g., you have the receipt for your purchase of a pertinent device with its serial number on it or a court order instructing Apple to assist in the provision of access to a decedent’s information from the deceased person's accounts). See How to request access to a deceased family member's Apple accounts https://support.apple.com/en-us/HT208510. if you want to contact Apple support to discuss an extenuating circumstance, see these support options:

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option.