Letter: Duped!

I met this nice lady on the ghanaweb classified section. After talking for a few months about getting her to join me in the USA, she informed me about how she had won a visa through the help of a "connection man". All she needed was help with plain ticket which she had the money for half the fare. I sent her the money. long story short, I haven't heard from her since she got the money and she doesn't pick up her phone when I call.