Airtel — my sim card is rejected from 1 week

Address: Nanded, Maharashtra, 431709

My airtel no [protected].. My name is ramesh kadam.. My sim card is rejected from last week it informed me that we are going update your number for 4g update. Suddenly no network is displaying on my phone. It the prime number for me. Please contact me as soon as possible. Because it is very important for me to keep this number maintain for document purpose. Though i m sick so i can't go for service center