Sprite — Sprite 2 litre offer not given

Address:

Ziaul-hasan , khiribagh,Mau Nath Bhanjan, Mau (275101)

Today, I purchased 2.25 lit of sprite cold drink which has offer of rs 20 cold drink free. But the shopkeeper cuts down that part where the offer was printed. When I asked about the offer, he told me that's it's cut from the company itself and refused to give me the free offer 20rs bottle.
Kindly take appropriate actions towards the shopkeeper and revert me back with the acknowledgement.