Consumer Redressal

My name is Mayank Bhalodia. I have ordered 1 TB Hard Disk from Paytm website for Rs. 4148 on 17th March 2015. When i was delivered the hard disk the package did not contain any invoice and neither did i receive any invoice in email. I wrote many emails to care@paytm.com but i always got reponse to wait for 72 hours and the courier will be reverse picked up til that time. After the completion of 72 hours no one come to pickup the courier and when i mail, i receive the same message to wait for 72 hours. When i called up on 1800 1800 1234, there is no one to talk to me but instead i am being told to record a message and send it to them. When i did that, i receieved a call from Paytm after 2-3 days and being told the same thing to wait for 72 hours and they will pick up the courier. But still no one comes to pick up. Its like they purposefully send me the faulty hard disk and does not want to replace it.Today is 24th April 2015 still the problem is not solved. Please solve this problem.