Puma — defective puma shoes received from authorized puma's seller online

Hello, i bought a pair of puma shoes online from flipkart's "retailnet" seller, which is an authorized puma's seller. But the product i received is defective. It has threads coming out of stitches and even the product didn't have tags on it.
They are in warranty of 90 days.
Order id od[protected]
When i called puma customer care number to claim my warranty they told me since i bought these online they can't replace them. They can only take my shoes and give me credit for future purchase at puma online store. Then what's the purpose of selling them online if the warranty procedure is different for that?
Therefore i request you to replace my shoes with a fresh pair.
Attaching my invoice of order and defective shoes pictures.