Big Bazaar / Futurebazaar / Future Retail / Hometown — cadbury dairy milk silk

Address: Kolkata, West Bengal, 700078

I went to purchase the diary milk silk chocolate as there was a 50% cash back offer in future pay on 14.2.19. I got the notification around 4pm and rushed to nearest bigbazar at around 5pm. ( Big bazar esplanade, Kolkata outlet).
They said that the item is out of stock and forced me to buy other items.
Also the customer care help desk did not verified about stock.
I need a detail about total stock received of diary milk silk plus opening stock on 14.2.19 and the time sale of last item.

I m of the opinion that the store is purposely suppressing the stock so that customers are forced to buy other items.

Regards
Customer
Mob no [protected]