2gb mp4 player - rediff / ojjas enterprises
Usb connectivity not working and different product

I had purchased a 2gb mp4 player through rediff shopping. The USB connectivity is not working and also the product is completely different which is displayed on the rediff site. When i sent a mail for the customer care support for the replacement i was given the email id of ojjas enterprises, Till not i ve not got a single reply from those guys. The order number of the product is 5006535.Please help me to proceed further.