they gave you money as an investment, you gave them back a lot less money, and you blame them for not calling it a great success.
See, this is where you're wrong. I gave them back more money. Although it does sound from your comments that you are highly likely to be evading taxes from the way you say, "less money" when what you really mean is "more dollars."
Did you take USD or BTC? Are you giving back USD or BTC? Is BTC money or not?
When I say "less money" I mean "less money", not "more dollars" or "more bolivars". Not a rocket surgery really.