Adidas — Adidas tennis shoes - refused exchange

Address:

Kolkata, West Bengal, 700157

I bought a pair of non marking tennis shoes worth Rs. 3799. I wore it at home thrice for a few hours and I found that it was not comfortable at all. After a week I went back to the store requesting exchange but they refused saying that the shoes have been used and cannot be exchanged. Unless I wear them for a few hours how am I supposed to understand whether it is comfortable or not. The sales guys were very rude and arrogant and told me that this is how the tennis shoes are for such a cheap price and that I should not expect anything more than this. I bought the shoes on 12th of Jan 2017. Since I found this forum recently hence posting it now. Please advise.