Airtel — airtel recharge 399 for my number is not giving me the exact offers as per the offer provided

Address:

Hyderabad, Andhra Pradesh, 500038

I have recharged with 399 for my mobile number through my airtel app, when the app showed me the offers as 84gb data and 84 days validity, but when coming to the message after recharging i got only 28days validity.

When i have logged into my airtel app in the best plans tab it showed me the offer as rs399=unlimitedlocal and std calls along with 84gb data (1gb/day on 4g handsets and 4g sim only) for 84 days.

Where as after recharging i got the message as

Unltd local/std calss (Mobile+ll). 1gb data only for 28 days.