Avenue Supermarts Ltd (Dmart) — Charged for same item twice intead of one

Address: Thane, Maharashtra, 421204

To whomsoever it may concern

I have visited Dmart, Ghansoli on 12 Feb 2016 evening around 7:30 PM and my bill came was of Rs. 2654.23 out of which i see i have been charged Haldi Mini S twice while i have only bought one. I revisited the outlet on 13 Feb 2016 to get the refund for the same for which they kept me waiting for 30 - 40 mins saying they are checking the CCTV cam. At last they say the video is not clear and we wont be able to refund to right now. They asked to come back later. The amount is just Rs 35. They wasted my time and travelling cost etc.. and again they want me to visit so again i have spend money to reach and also spend my time on Rs 35.
It the mistake of the lady at the counter for which why should i suffer.

Regards,
Anirban