According to his description, he apparently used our products in a completely wrong way and therefore could not work properly.
We patiently explained to him the correct way to use, but he open case on us. Do not admit his own mistakes,and make a sophistry.

OK，you get the money back，but we expose you.
I hope you think your reputation is worth it.
Oh, no, for shameless people, is there any reputation to speak of？