Airtel — incorrect validity of 399 plan

Address:

Pune, Maharashtra, 411014

Recharge done on[protected]:45am, mrp:rs399.00, gst 18% payable by company/distributor/retailer:rs60.86, transid59391396.

I recharged from the airtel app. It showed me a validity of 70days for the 399 plan.
After i purchased it is now showing a validity of 28 days.

Rs399=unlimited loc+std all calls and 1gb/day 3g/4g data+ 100 l+s sms; validity - 28 days. T&c apply.

I am attaching a screenshot where the app is showing it in my offers, 399 plan with 70days validity.