Consumer Redressal

I have purchased a HP Compaq 610, 615 Laptop Battery on my sister\'s name: Sivaparvathi K, on Jun 30,2013. Recently It started giving problem and I informed the website owner through mail and phone. He told me that he would receive the battery through blue-dart courier and replace it with new/repaired one. So he did it. He took my battery on around Dec 6th 2013, and not giving back my battery. He is not lifting my phones and not replying to my mails. I have the receipt and mail communication with him. His website name is batterypriceindia.in, He blackmailed to me recharge his cell phone to return the battery, I did. But again he cheated me. Please help me. His mobile no: 9555671710/9873585073(Mr. Singh), His mail id: batterypriceindia@gmail.com. Please shutdown his website, and help me, getting my battery back. Thank you.