When you see some exchange that you never heard of, especially if someone sends you DM and asks you if you are interested in profitable investment - avoid them like a plague. I get messages like this at a daily basis.

To be honest usually it is obvious that this is scam, you are first person that I heard of that fell for it.

If they ask you for more money DO NOT send them any more, no matter what they promise you.

Maybe you can report them to police/ sue them, but I dont have experience with it.

Only thing I can think of to get at least some of the money back is to tell them to tell them you are not feeling comfortable to invest if you don't get at least SOME money back. They could send you some back in hopes that you will send them more later. Little far fetched, but worth of try, considering that probably you lost all funds now.