Low price, but bad quality

I chose mainly due to the low price for this product. The delivery of Amazon was as usual very quickly and easily.
When I took the part of the package, I immediately saw that the surface of the hubs was scratched. Somehow dust or dirt had fallen into the packaging and the dust scraped like sandpaper between the surface of the hub and plastic wrap. However, this would have been no reason for a bad review for me in a low-priced product.
However, I have, after I had unpacked the part, notice that the processing was very bad and worse, that the plug for the power supply was completely corroded. That's my opinion, but then the good too much, as this may cause short circuits everything possible about Schwellbrände. I have the Hub then not at first tested, but complained about it directly.
Perhaps one should drauflegen 5 euros and afford a better quality product.