Q: My device has been locked because of my Apple ID

A few days ago, my gmail account was hacked which was also my Apple ID on which my iPhone was activated. Soon the hacker also hacked my iCloud account to which i paid little attention till I reset my phone to get rid of the notifications.

As a result, my phone is now locked as it requires me to fill in my Apple ID and the password because it had Find My Iphone activated on it.

P.S: I tried to retrieve my gmail account numerous times, but was unsuccessful at verifying my identity as the hacker has changed every minute detail. Also, I upgraded my phone to iOS 10 if that makes a difference to anything.

Is there ANY way out?