Try calling again. Different rep different solution. I got my iPhone unlocked within 10 days of activation. I still had about $500 balance owed on that phone; but i had bought it from t-mobile directly. They usually want us to wait about 40 days before they can unlock it.
The only difference on your case is somebody else bought the phone. I don't know how that works, but give another shot.
I would tell them I am going to Nepal in two weeks and need it unlocked so it works there.