I, too, unfortunately did not research before starting business with these frauds. All their products appear fake and I doubt it's a real auction at all - I saw what appeared to be glitches in software. I had to have my credit card cancelled and have multiple transactions in dispute with my bank; I am going to try to dispute the shipping charges as well, as that's how I think they keep making money. Google playstore is working on removing their mobile app, as they also found some anomalies in addition to my report (which doesn't work well anyway - another red flag). Have reported them to the FTC. Will be reporting to other federal agencies, UPS, the Postmaster General, and the State of California, as that is where there merchandise is sent from, and to anybody else who will listen.
What tipped me off was an inadequate response when I tried to track an expensive purchase - either the link or the tracking number was bad but I kept getting the same canned responses from customer "support." Phone calls went to voicemail. When I threatened to report them for credit card fraud they responded IMMEDIATELY, but the response was still inadequate.