Rediff — Defective product

I purchase an ELECTRIC RIDEON KIDS CAR by order no 4458983. Which was delivered me on 16.03.2008. After unpacking I found that I doesn't have THE DRIVER SEAT. I immidiately booked a complaint in the format available on their website and called the the customer care. Since then I am regularly mailing my grevience by mail and calling them regularly. Every time I call they just give the assurance that problem will be solved soon. Even their customer care personnel dosnt mean what they assure.
When i track my order for latest dovelopments by "track my order" method, it shows that product delivered to courier on the date of visit to website. I dont know how can it happen.They cant handover a product everyday to courier.
I am really fed up and the only way left to me is to approach the consumer court.
By this complaint I mean to convey rediff that they should solve my problem within next 7 working days or otherwise will approach consumer court (under provisions of IT ACT, 2000) and all responsibility should lie upon rediff and its concerned vendor.