Airtel — not receiving sms on airtel sim because of no recharge

Address:

Miscout main khadhi bhandhar road motihari, East Champaran, Bihar, 845401

I have not recharged my airtel last month airtel stops incoming and outgoing calls but also stops to not receive sms because of this i m not receiving sms from irctc, bank otp, and other otps and etc... I want to know why should airtel stops this service of not reciveng sms because of this i m facing big problem because i not able to recive otp and other imp.. Messages...