AliExpress complaint: Item not delivered or refunded

According to Ali Express logistics, the order was delivered on the 4th of July. On the 10th of July, I went to the open dispute and submitted a request that the order was never delivered.
Ali Express responded to my request on the 19th of July saying: … you didn’t provide us with the valid evidence to prove you haven’t received the package within the limit days. First of all I contacted them within the period of time allowed but they were very late with their response. And second, what kind of evidence can I give them to prove that I didn’t receive the item?

I’ve contacted my local post office, they say contact the seller. I contacted Ali express again and made an Appeal which was rejected again for the same reason mentioned above.

The seller refuses to issue a refund and Ali express representative doesn’t understand that any problem with delivery is not the customer’s responsibility. The correct way to handle this was to either send the order again or issue a full refund.

If this was Amazon, they would have resolved the issue within 2 days and issued a full refund. These guys are a joke. It took them 3 weeks to respond and in the end no refund. I’ve paid £28 for something I never received. The seller doesn’t understand how to communicate with their customer and Ali Express representative has no understanding of the basic customer service.