Airtel — Data and mobile recharge pack

I am a Airtel user since 21th jan 2020. And since then i was recharging my sim with 399 pack for 56 days, which gives me the access of internet 1.5gb per day, free calling and 100 sms per day. But recently i noticed that i can't use the pack fully. I found some of my friends get their unused data of whole week at the weekends, but i don't. Yes, instead of this, i used that network. And then recently i again discovered that i am unable to make call, or text, or use any data on the 50th day of my 56th day plan! And this is ridiculous. Do something as soon as possible. Because i have to attend my classes. Take action. Please.