Flipkart — Asus Zen laptop

Address:	Bangalore, Karnataka, 201301
Website:	Www.flipkart.com

Hi,
I ordered asus Zen laptop and few days after I got a call from courier guy subhash, that he, s waiting for me with the packet. By the time I reached there he was gone and his phone was unreachable.
Few hours later I got an SMS that my courier is delivered ti someone they called my friend Rahul Sharma. I immediately called Flipkart to let them know they've delivered it to wrong person.
I personally met the courier guy and he told that he delivered it at a nearby bridge to 2 guys on bike.
Now when I'm following up with Flipkart, they're claiming that rahul Sharma is my friend and they've delivered my courier at door step.
I'm now following up with Flipkart since 1 month and now they're refusing to return my money 49, 800.

Please help