I have seen one blog owner is coping my content and putting in his blog. It is totally illegal to use duplicate content. Where I can complaint for this?
It is not legal to use duplicate content if you don't allow it. As a first step, you can try to send a warning email to the blog owner. It might help. But if it doesn't, I am not sure where exactly you need to complain. You can try to search it on the net.
1. Contact him (tell him you're going to contact 2-3-4 ). 2. Contact his hosting provider. 3. Contact his domain register. 4. Contact Google, AdSense.