Airtel — sim no service mode from yesterday

Address: 629265

I am muruga from tamilnadu holding airtel mobile no. [protected]. I holding this number for last 10 years. Yesterday night it stopped working, and showing only emergency signal. I am not able to call (Dial & recieve) anywhere including customer care (121). You plz resolve this problem asap. Its very urgent. A customer for more than 10 years should no be treated like this otherwise tell me what should i do?. All my business linked with this number