I tried to register for the US green card program. I got to an advanced stage and this lady with the credentials:

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. Keeps calling me, demanding to know my credit card information so that I can be upgraded to VIP status. I Think this is fake. Please can some one educate me more on what I should look out for next time?

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I went to the website and did some checking. This is a fee based site. They charge for what they do.

Green Card Program-advantages USAGC

Are there additional fees?
There are no extra charges for participating in the American Green Card Lottery Program, aside from the fee for using the on-line registration.

Frequently Asked Questions - Green Card Lottery