3. Refuses to return my absolutely clean coins, which are not tied to anything except licensed exchanges. (You can check this yourself in the blockchain).
There is just one detail which I think your thread is lacking which could have answered the question asked by @examplens, which is providing the address you use in funding the go-go exchange account, which the address could have been used to check if the money is still intact or if the exchange has moved it to their other wallet which could be considered as spent. I tried to get the address from the details you provided and it seems you moved the coin through multiple exchanges before your final destination.
This is the wallet that go-go gave me.
You can see here that they sent my coins to another wallet.