How is it a scam then if they say your funds will be available in3 to 5 days? To me that says your money is not lost, there is just a waiting period. Perhaps just exercise some patience, I know its very inconvience. Don't use them again. Have you done any transactions with them before? I don't think its a scam. It's just not the most efficient service.
Unfortunately, this is true. Deep down somewhere in their EULA, they would have said that "deposits could take 3 - 5 days" and that sort of gives them authority to do that since you might have accepted the EULA
This is why I feel the cryptocurrency regulation is important. Security exchanges regulated by SEC can't think of doing such a sh*t under their eye