Shopping. Rediff.com — online shopping

I had ordered for a pen camera with good features on rediff shopping and the order number was 5458217 . However, when i received my product (date 08/07/09), I was shocked it was not working.I raised a complaint with customer care. Also I receive response from them. They asked me to send back the product to the vendor. I send back the product to the vendor (date 13/07/09). After that they didn’t respond. Now I am worried about my money. I had send many emails thru rediff customer care but they didn’t respond for my mail. On 21/07/09 I got a Rediff Gift Voucher worth Rs. 230 as a refund towards the courier charges incurred by me during the sales return(13/07/2009). I need my refund which I spend to buy pen camera (Rs. 1614). I request the concerned authorities to take necessary action against them and ensure that the rights of customers are taken care of.