I have used this site for 4 times for online shopping and except once I had to return the product every other time. The reason was that I used to receive either a duplicate product or the product that was not at all as described in the specifications.
Also if you look at the photos of the product on paytm the are quite misleading to the originality of the product. The only reason for me to choose paytm was the heavy discounts and cashbacks they give.