I've come across to an elaborated scam, where some guys call people saying that they
represent an offshore investment company based in Tokyo and is helping people building a stock portfolio.
They will provide good investment advises and if a person starts to invest with them, they will continue to provide good financial advices building trust and letting people invest even more money.
When, for any reason, a person decides to redraw part of the money the problems start to appear.
And in order to solve them, a person is asked to keep sending money creating a vicious cycle where they never return that money.
Mann International is an example of this type of scam, they say that they follow strict regulation rules for SEC (short for U.S. Securities and Exchange Commission - go to their home page) but if you consult with SEC they will tell you that Mann International isn't register with them and you should consult the Company Country Financial Regulator.
In the case of Mann International it should be the Japanese Financial Services Agency since they say that are based in Tokyo, but if you go to their home page and click on the link Cold Calling would find that Mann International is identified has a company that doesn't exists in Japanese soil and shouldn't be trusted.
Another interesting fact about Mann is that when they ask you to wire them money they are always changing their bank and the account name and the never use Mann International has the account name.
Hope that this article contributes to help people avoid this type of scam.