Simply, they disputed the payment and now have the item and their money. So, they didn't actually pay for it and are guilty of fraud.

 

Good luck with pursuing the matter, though. eBay have demonstrated they don't care and no Australian agency has jurisdiction overseas.

 

You could try AFCA or the ACCC, using eBay/Adyen as the culprit. I have no idea whether you will have recourse.

 

But your post reinforces why I don't sell internationally.

Your buyer is telling you what you want to hear. They are scamming you. You lost. You won't get your money back, or the item. The only winner here is the buyer, and they know it.

"But your post reinforces why I don't sell internationally."

 

Nor I.  AU only.  I'm staying well clear

To find out how genuine your buyer is, ask them to repay, as it is they have the item and a refund.

When a buyer makes a claim via their financial institution,  ebay purely acts as a go between, passing on the information you provide.  The decision is made by the financial institution, not ebay.

As for your buyers client, that is all distraction, nothing to do with you, ebay or the payment institution. they are not party to the transaction or dispute.

OP, Adyen is indeed the relevant financial institution.

 

Make sure you have all the evidence to present to AFCA.

 

 

But I am detecting a whiff of deception from your buyer. I may be wrong.

Adyen is definitely correct, You could have success with them if you keep pressing them eventually an eBay rep from high up should reach out to you and hopefully help you. 

I don't know the situation of the case so cannot help you as its limited detail and can be false
However would just like to touch on a few points, which will also help future sellers with this issue.

- Any financial institution can side with the buyer for whatever reason, that's got nothing to do with eBay, hence why the dispute fee is charged. There are multiple layers to this which extends past Adyen etc. You can always appeal it.
- Tracking on Australia Post only last for 60 days after the last update publicly, Sometimes they do have archives but most financial institutions rely on the webpage or API. So if you don't upload tracking on eBay or it doesn't load for what ever reason, you aren't really protected.
- You stated no returns which I can understand, however if the item is not as described you do have to honor the return, even if the buyers wrong or you don't agree with the reason, its standard eBay policy and on most other platforms. Majority of the time the buyer has to return the item for a refund.

That being said best of luck with your dispute.