They are apparently in liquidation or bankruptcy or something, with the site still up (when I last looked) and behaving like you will get cashback. But you won't. Maybe the lawyers are getting it all now? IDK but don't use them. Just don't. I was ripped off, and hope by posting this someone else won't be.
Tip for consumers: Do not use this site - it may have been OK at one time but is a scam now