AliExpress complaint: The case is closed with no Refund unfairly

I ordered a solar security camera from Aliexpress. The item is damaged and I was asked to send back to get a refund. This item has been sent through NZPost to the seller (Aliexpress) but for some reasons the parcel got stuck at Hong Kong airport. Aliexpress asked me to send a document from NZPost to them. I did send all the information provided from NZPost to them. NZPost also asked me to ask Aliexpress to send email address so that NZPost can contact them directly. I request this to Aliexpress as well.
About a week later, Aliexpress decided to end the case and decline to refund me without warning. The cost of the goods plus postage to send the camera to Hong Kong is approximately $200.
I did asking for explanation, re-open the case and compensation. So far they decline and I am now I send $200.00 for nothing
Much appreciated if you can help since I believe that it is unethical and unfairly treatment.
Best Regards an Tan ([email protected])