Homeshop18 — product not yet delivered

I booked Sandisk 4GB Micro SD Memory card (Buy 1 Get 1 offer) via Homeshop18 web site and I paid the money for the same thro' my debit card on[protected],
I received their order acceptance No[protected] to my mobile as sms on the same day[protected] and their delivery period given as 6-7 days.
But till date I've not received the product. Then I started calling to their phone number[protected] from[protected] and made complaints on with their customer care for more than 8 times,but but they are extending their time for deliver the product by 48 Hrs every time, but till date they have not deliver my product to me.
Kindly take some serious action against this , coz like this they may cheat many people all over.