well this happened with me... a user "amcfad2" here who got me doing his logo never paid me. He got me to do a logo for www.biddycent.com and asked me that he will pay after the work completion. But when i completed the work he just simply used up the logo everywhere...on the website,facebook pages,videos everywhere. I doubt if he can scam me then his website www.biddycent.com may also be a scam. Though it was for a small price $30 but it's not the money...it's the thing that he used my logo without my opinion. if he would have requested me to do a logo now and he would pay me whenever in future he had money..i would have happily agreed. But he just scammed.
send his host a DMCA notice for the logo. In the future, watermark your images and don't send the final image until payment has been made.
thanks for the advice lothos...would send a notice as u mentioned. And yes would also watermark my work before sending in future dealing. Ur help is highly appreciated. Thanks