Scammers alert!
They call you with big promises, after you put in the €250,- they start 'trading' with your money and increase it a lot within a week. During this week they try to brainwash you by story's of their own winnings after they took a loan from the bank and invested. They will ask you to take a loan from the bank aswell. Even if you are poor, these people have no moral sence whatsoever. You will never get your money back again.