If you can't unlock the phone, show valid proof of purchase to Apple tech support and see if they can help. This article ...

But first, it's essential to know how to unlock an iPhone ... Apple ID and password. That's why it's a good idea to back up ...

How to bypass Apple’s activation lock If an iPhone, iPad, Mac, or iPad is locked with an iCloud account, the only way to unlock is it with the password of the account or by getting in contact ...