He said the item has problem，but the problem is hard to be show in picture or video，he want refund，we ask him to return the item back for refund,he refuse to return the item,and says he insist to throw the item away.
He is highly possible lying, he want the item for free,so saying some problem that is not able to verify remotely，and want refund without return it.
Making threat? remember that we never refuse to refund you,but we have right to have the item back
Guess what, now you got exposed. Happy now?

Very Very BAD buyer