Yesterday I wanted to buy  
<a href="http://www.olx.com.ng/vehicles/cars/" / rel="nofollow">used cars</a> on olx. 
I found a Blackberry phone and contacted the seller, he asked to make an advance payment, and I did. Then he disappeared. 
I have written to a support of the OLX and said about scam but they said that I blame myself, how do I get my money back?