Airtel — airtel offer 399 rs for 84 days validity not applied on paytm recharge

Address:

560062

Vinod here from bangalore and i am using airtel prepaid sim for more than 10 years and below is my concern
I received sms from airtel for the offer rs.399 unlimited calls and daily 1gb data for 84 days validity (Attached sms). When i recharged using paytm for the same amount 399 and on the same day, i only got 28 days of validity.
When i called airtel customer care they asked me to send email to [protected]@in. Airtel.com with the screenshot of offer sms.
I did so and after 18hrs i got a call from airtel and the reason according to them for not getting offer was due to recharge using paytm.
For being sincere and loyal customer to airtel, they could have given offer this time and educated for next time. But all i heard was sorry we could provide you the offer.