Airtel — after recharged the plan 399 for 70 days the plan has changed for only 35 days

Address:

New Delhi, Delhi, 110044

So please transfer and extend for 70 days as per provided plan by SMS received and find attached screenshot.please provide me for 70 days. Otherwise I will port sim to another sim
Message
Enjoy Unlimited All Loc+STD calls+1GB 3G/4G data per day on 4G H/S(1.25 GB for other H/S) for 70 days. T&C Apply.To check daily data limit *125*1541#