How to get an activation lock removed. iPhone 7 Plus.

See if you can recover the ID/password. Use every email address you can think of.

Apple ID - How to find your Apple    An iCloud e-mail address is an Apple ID.

Apple ID - Find              

If you forgot the Apple ID password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification  email option if necessary.

Apple ID - Manage            

Apple ID – Forgot Password            

If necessary, if you are the original owner, contact Apple. Apple can remove the ID  if provided the required paperwork. 

Request additional support for unlocking your device

Either take the device, the original purchase receipt with the serial number, and a photo ID to the nearest Apple Store (if it has reopened). Call the store before going to make sure they can help.

Genius Bar Reservation and Apple Support Options - Apple.    

or contact Apple ID Support. 

 Apple ID - Official Apple Support.    

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

Get Support   https://getsupport.apple.com        Work through the screens to get a chat option. 

Apple Support schedule phone call        

https://twitter.com/AppleSupport       

You will need to provide apple with the proof of purchase to verify that you are the rightful owner, and that it is not a stolen device locked by its previous owner.