I’ve never had any huge issues with banggood CS. Always explain the steps you’ve taken to try and fix, take a video or photos. When it’s a fault that’s terribly hard to show in a video I have had to desolder a wire and just say it’s not working, otherwise it can be a mission getting a fix. The worst case I had was 10 emails proving my Convoy L6 was missing the lanyard ring, they kept saying that’s normal haha. All I wanted was a replacement ring but instead they sent me a replacement L6!!.