I don't understand the attack the victim mentality here. Dung is no noob who can't wait 20 minutes for his item to ship!
Regardless of item price. If it was advertised as new it should work. It was not sold as-is. It arrived not working.
The seller should not be ignoring his clients no matter how long he has been in business.
Dung, can you get an estimate on repairing these (including shipping)? Maybe ask for a refund of that amount?