Fastrack — Unethical behaviour

Address:

Bangalore, Karnataka, 560054

Visited the fastrack store at 210 gf, new bel road, bengaluru 560054 on 29/06/16 looking for glasses to protect my eyes from dust & bright light, having undergone cataract surgeries on 25/05/16 & 26/05/16. on explaining the requirement, the store sold me item code m050bu2 (metal) for inr 1676 (after 20% discount on mrp inr 2095 vide tax invoice no.[protected] created at 18:32 hours). i put the glasses on and walked towards my car. but these glasses allowed wind from all sides as there were pads for resting on the nose and there was a gap between the nose and the frame. a lot of dust hit my eyes. to prevent further discomfort & possible damage to the eye, i preferred going home to revisiting the outlet.
Next morning (30/06/16) i called the outlet to discuss this but i was asked to call back later, as the manager was not in. so i personally visited the shop that evening, and checked out what i could take in exchange, but nothing was suitable. i explained the situation including the fact that this article had been offered as suitable to meet my specific requirement. but was told i could buy a watch or a bag instead. i didn't need those items and it was imperative i get the glasses. but was told that the policy doesn't allow refund. i offered to leave the glasses and come back for refund after it has been sold. but was told that no deviation could be made. it did not matter that a customer had been sold the wrong item!.
I left the article with the case, invoice, warranty card, etc. at the store with a request to get back to me, with a more customer friendly approach.
I look forward to an understanding of the situation & the fact that a wrong sale made by the salesman and arrange to refund the money.