They say you can get refunds, but in practical reality, that promise is as worthless as having life insurance in a bankrupt company.
I bought a video game system for $20 US. I was really excited as it was a portable gaming system with more than 300 games. When it came though nothing would happen. I uploaded a video proving it was faulty and the seller said no refund just recharge it and everything will work ok it has been tested.
I replied back saying I had already charged the system and it won't work. I was then told ok we'll give you your money back. When I went to the post office I found out that to get it with tracking which was a condition to the refund, it would cost $30 US to do so, more than the total cost. Aliexpress has also said it must arrive within a certain time frame.
So I asked the post office about the cheaper rate, it would take longer to get there and no tracking. The post office assured me that by having a copy of the receipt and a copy of my customs declaration, surely I should get a refund. So I did, explained this to the seller, scanned a copy of the documents and even though it is sent no refund.
Also on Aliexpress' site to get your refund you must give them a tracking number. I am however glad I did send it back. This way I know for sure their refund policies are worthless, so I won't bother with them next time. I can say I did send it back with no refund.
Also I've bought the same video game system from someone else. It was also faulty. So this explains everything, those who sell faulty items know that if they sell it at a low enough price, people won't bother to return it.