Can't Unlock my iPhone its carrier locked
I punched this device from abroad and I accidently got a locked iPhone from the seller. I got to know this after I came back to my original country, later after 1.5 years through apple support I was informed that it is locked with At&t. I then requested At&t to unlock it through its free web portal. After 5 minutes I received an email saying "We can't unlock this device". How I am suppose to get it unlocked? I have not done any fraud nor I was aware that its locked with At&t. Please help me out ASAP
We can't unlock this device.