Airtel — offer on a new smartphone

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I have bought new Nokia 6.1 plus from Flipkart and there was an offer from Airtel of getting ₹1800 cashback in the form of 36 coupons and 240gb data in the form of 20gb data per month on recharge of 199/249/448, i have done 199 recharge twice, but didn't get the cash back and extra data, i have contacted Airtel customer care and they told me that i would only get cashback of ₹2000 as it is a festive offer on buying any 4g phone and no will not get extra data
i didn't claim for the festive offer, i don't want it
i want my bundle offer of ₹1800 cash back and 240gb data which comes on my handset

i had contacted Airtel customer care so many times and they told me that they are no such offers provided from Airtel, but there is an offer on flipkart
i have requested to give me the SR number of my phone number but they don't know about that too

Airtel is playing dirty tactics to its customer, first they advertise an offer on buying a new phone and when you actually buy it they won't provide the offer which you were looking for and instead provide a different festive offer which is of no use

if you can't provide the offer then why are you making us fool by advertising it every where