Rediff Online Shop — Fraudulent product delivery

I had ordered for an weighing scale through Rediff online shoppe worth INR 600. It was delivered through Blue dart, the payment was done priorly. The product delivered was broken, when we contacted the rediff sales personnel, they asked us to return the product through courier for which we had pay INR 200. Now these guys promised to deliver workable product in 7-10 days. Its been a month now, but no avail... There is no response.

"We spent INR 800 for nothing..."
Its not the money I'm worried about, Its how one can get cheated.
Please do not buy things through rediff. They are pathetic.