Aliexpress Alibaba Subsidiary Defective product received and no way to get a refund or replacement Shenzhen,China Internet

I  am an electronic tedh.I have bought many electronic parts,used in repair,from Chinese Ebay sellers,with great success.Recently bought a part from a Chinese seller,on Aliexpress,since the part is unavailable from any U.S. seller or Ebay seller.Got the part and found it defective.Aliexpress promises to protedt buyers from not recieving goods or bad products.I filed a complaint.Was told I had to ship the bad part back to the seller to get refund or replacement.I shipped the part back,at my expense and never heard from the seller again.Contacted them and they promised to send replacement or refund.I guess I'm done,and would recommend you avoid Aliexpress or it's parent company,Alibaba.