reply time from Apple support
I submitted a request for removal of activation code for a purchased used iPhone. How long to receive an answer or have code removed. I sent all requested information.
iPhone 11 Pro
I submitted a request for removal of activation code for a purchased used iPhone. How long to receive an answer or have code removed. I sent all requested information.
iPhone 11 Pro
For activation lock, it can take some time. But, I doubt that the lock will be removed as you are not the original owner. You're better off returning the device.
reply time from Apple support