Well, I bought mine used from Audiogon so I have no idea who is the original dealers. I guess all these audiophile stuff are somewhat niche product, so they don't really go out their way to offer great customer service for everything. I had similar experience with Stax headphone (way worse).
Anyway, thanks everyone and I bought the item recommended by alucard19.
Anyway, thanks everyone and I bought the item recommended by alucard19.