Push 2nd hand product as a new product

Location/place: Bankura,West Bengal

Name of company/service: HP

I bought a HP Notebook PC for Rs.42,500, from Authorised HP Dealer – Microcare, Gitanjali Building, Malancha Road, Kharagpur.Ph no 03222 254187 having Model No – g6-1201TX , Sl No- 5CD1387SK1. My purchase date on 20/04/2012 but within 2 months the operating System crashed . Hard disk backup and DVD RW not working.I contact customer care on dated 12/06/2012.My calllog ref no- 4676132723.But they did not send operating system disk and not replace DVD RW .Then I contact HP center through mail. They reply “Tapan, I am afraid to inform you that software comes with ninety days of warranty irrespective of the warranty of the unit and as per this serial number ‘5CD1387Sk1’ software warranty has been expired”.But my question is “how it is possible?”. I purchase this product on 20/04/2012. I have an original Invoice. So not exceeds 90 days. But when I check warranty details of my product on hp website I saw the product purchase on 25/09/2011 and my warranty has been expired. HP is reputed brand why they push 2nd hand product as a original product. Kindly tell me what i should do to get it replaced.
For a reputed brand like HP,How it is possible?
I hereby request the company to replace the Laptop or refund my money and also take proper action on this fraud case.