Rediff Shopping — Order not yet delivered

I have ordered a book, Order# 12760266 on 29th Nov 2015, and these people committed to deliver the product within 4-7 days. Till now i didn't receive the product. I contacted more than 6 times but they responded only 2 times, but every time I got the same response that "Kindly note that we are investigating your order status for order no. 12760266 with the concerned department.", from their customer care. This reply I got on 5th Dec 2015. Still their Investigation is going on. After that many emails i sent to them regarding the same, but no reply. I want my money back. My friends denied me to buy anything from rediff but I thought these people would be following some professionalism and customer delight but delight is far, they are not giving the product even for which i have paid. This is the reason why people prefer Amazon, Flipkart or other websites. Pathetic service. Dont buy anything from them. In my experience, biggest fraud in online shopping is REDIFF. Nishin