forget activation lock

Ok, did you retrieve your Apple ID email using the instructions listed above?

If yes, then what happened when you did so? Did you forget your password? If you have logged into your Apple ID from iCloud.com, then you can use those same credentials to log into your iPhone and turn off Activation Lock.

If you have forgotten your password, follow the instructions listed on this webpage: If you forgot your Apple ID password - Apple Support

Whenever you see blue text in a response, that indicates a webpage that you can click to open.

You have been given the link to recover your ID multiple times. PLEASE use it.

If you are unable to successfully recover your ID using Apple's iforgot service, then you will have to contact Apple's account security team directly: Contact Apple for help with Apple ID account security - Apple Support

The Activation Lock will require the original owner of the iPhone.

Turn off Find My iPhone Activation Lock - Apple Support

If you forgot your Apple ID - Apple Support

What happens when you follow the link Rudegar provided above:

If you forgot your Apple ID - Apple Support