Since you are providing support for Topping products, let me ask about another return I am in the middle of.
I bought an A30 Pro from Aoshida USA though their Amazon web store.
It has a faulty left channel. Every once in a while the left channel goes to half-volume. I have isolated it to the A30, without a doubt. Multiple cables, multiple sources, and three different headphones all show the same issue. Also, in the process of swapping cables etc., I noticed that if I tap the top of the A30 case, the signal reverts to full volume. So, clearly the A30 has gone bad, with an intermittent problem. Possibly a bad solder joint by the symptoms but it doesn't matter, it's broken and doesn't play music. It took me about 12 emails over the past two weeks with Aoshida to get to this point. They wanted to work with me on this with multiple rounds of email, asking for videos of the unit malfunctioning (How do you reasonably take a video demonstrating the unit has an intermittent channel? A trace on an oscilloscope while it is malfunctioning would work, but to be honest I am not interested in doing this diagnostic work and I am pretty sure Aoshida would have no idea

, I hope you appreciate!) The entire time, the burden of proof is on me to demonstrate that the Topping product Aoshida sold me is defective

.
So, after all this, Aoshida give me these instructions (exact text):
Sorry for the delay reply, today TOPPING factory reply us that they are not sure the reason, need to test it. TOPPING product support one year warranty.
You could send it to our China address, and we will repair it for you, do not need repair fee. But you need to pay for the shipping cost from US to China. Of course, we will pay the shipping cost from China to US. Of course, you can buy insurance for it.
Logistics requirements:
1. It must only pass USPS postal logistics, not UPS, DHL etc.
2. The declared value of the package must be declared US$20.
3. If the declaration is not strictly in accordance with 20 US dollars, the package may incur customs duties, which should be borne by the customer.
4. Before sending the package, please send us the pictures of all product accessories.
5. After sending, please tell us the tracking number.
6. After repair, we will declare this package at USD$10 and ship to you, maybe you will not need pay the duty.
Our address is :
Recipient: Weilin Wang
Address:Room 101, Building 6 Hongfengchuangyiyuan, Jiangxia Cun, Huangshi Street, Baiyun District, Guangzhou City, Guangdong Province, China
Zip code: 510420
Contact number: +86 13660337403
7. Please tell us your full name , address, and telephone number. After fix it up, we will ship it back to you.
Reply awaited,
(Aoshida hifi)
Again, your team seems to think that after paying money for broken product, that the customer needs to pay more money. And that it is OK for the customer to not be able to sue the product they paid money for for a long time.
Also, your team seems to think the burden of proof lies on the customer to show that they got a bad device. NO! The burden is on your team to sell working devices!
Also, seems that there is a systematic practice of trying to avoid taxes, I think this is illegal although I am not a import/export tax expert. Many of us are getting asked to do this, very unprofessional and seems very illegitimate way of doing business.
This is the same as Shenzhenaudio did for my PA5. That turned out poorly. While Shenzhenaudio did eventually refund my money, it was after the long negotiation over 5 months.
I am not going to play this game again.
In summary: I need help getting a full refund on my defective A30 Pro from Aoshida. No more proof, my sales receipt and my returned product is proof. And, return shipping needs to be paid for by Aoshida, and I am not going to participate in a tax evasion scheme.