We have sent a request to the exchanger to clarify the situation and will keep you posted.
Had they responded to your queries? I have seen the Fox exchange still on your list. (For side note: there is no search button to find a specific exchange, I just use the browser find option. It would be better to add a search button on the site).
However the below quote drawn my attention,
I only trusted them because they are being monitored at bestchange site. I do not trust them with my private documents. I hope bestchange admin will remove this scammer from their website to save other people from getting scammed.
The victim chose Fox exchange just because of its being monitored by BestChange. So I believe BestChange will take the right decision after discussion with the Fox exchange.