See:
If you forgot your Apple ID https://support.apple.com/en-us/HT201354
If you forgot your Apple ID password https://support.apple.com/en-us/HT201487
I think you are likely to have to provide answers to your security questions.
See If you forgot the answers to your Apple ID security
questions https://support.apple.com/en-us/HT201485
If you have trouble answering your security questions and are told we don’t
have sufficient information to reset your security questions, then see:
Security and your Apple IDhttps://support.apple.com/en-us/HT201303(this section Employee
privacy and security policies)
This section 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.”
Still you can try to solve your problem by using the support options below. Be ready to provide any additional information to Apple you think may be pertinent to solving your problem (e.g.,your original purchase receipt with the serial number of the device on it).
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 Supporthttps://support.apple.com/apple-id
Apple ID account security for country-specific and
region-specific helphttps://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.