Amazon India — unethical behaviour and fraudulent

Amazon cheated me by selling refurbished dell laptop without mentioning that its refurbished while selling in the product details. After using hardly for 5 times, laptop gets shut down upon slightest movement immediately after 11 days from purchase date. When i reported the same with manufacturer, dell informed me that its refurbished product. I forwarded the same email from dell to amazon asking for justice, they said return window is 10 days but since i have forwarded the mail from dell stating its refurbished, amazon agent said i would get a refund or return with in 5 working days (5th november 2018). When i checked today with them, they are clearly and recklessly saying that they would ask manufacturer for warranty extension. I dont accept this, i have wasted my 50, 000 rupees to buy a faulty product and they are expecting me to have it by getting it repaired all the time.