Assetsclaimback Advisory review

I have invested money into the bogus site Shanguanfx and Wintersnowfx , which was a bad decision. If I had turned around, I would have seen it. Anyhow, I was defrauded of my money and am now consulting with Assetsclaimback Advisory to get it back. I was wondering if anyone had ever used them people said they are scammers but they have helped me recovered more than 50% of my lost funds, should i be worried?