Not only it's a scam but they also clearly did a corporate identity theft, by looking at companies house!
Why do you say that? It's very easy and cheap to register a limited company in the UK and they don't check any details.
OP
You might want to call Mr. Saleh of R.U.B. Exchange on 00 44 20 8452 9189 and ask him if he knows Eller Otte. Probably a waste of a call, but Saleh is registered as running a business from the Cricklewood Broadway address and Otte is supposedly the company secretary/director of Cryptwhatsit.
Or you could spam their FB along with other unhappy "investors".
https://www.facebook.com/Cryptoconomist-Limited-640436376100681/timeline/Not much sympathy though. What are you stupid, greedy, or both?