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
You could also use Having trouble signing in/iForgot https://iforgot.apple.com/password/verify/appleid to
identify either or both.
If you can't retrieve your Apple ID/Password and can't answer your security questions, see:
Security and your Apple ID https://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.”
I think it is unlikely that you will be able to solve your problem. Still you can try 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 Support https://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.