How to recover access to iPhone locked with another iCloud?

My iPhone is locked with another iCloud

Hello,

I was scammed by fraudsters. They made me sign out of my iCloud and sign in to theirs. After that, they locked my iPhone and now demand money to unlock it. I want to recover access to my iPhone and remove their Apple ID.

I can provide proof that the device belongs to me, including the box with the serial number. Please help me unlock my iPhone.

Thank you!

[Re-Titled by Moderator]