Airtel — sim stopped working on 18 august 2018 and not activating again

Address:

Dehradun, Uttarakhand, 248001

My airtel no. [protected] stopped working on the morning of 18 august 2018. At first i thought that it's just the network problem and i waited for the network to go live again but it didn't. So i called customer care in the evening regarding my issue. The customer care executive told me the my no. Is working fine, it's just the physical sim card that is not working and i have to get a new sim card from the airtel store. As the sim was not on my id, i had to ask my brother to get the sim for me. He went to airtel store on 21 august and got the duplicate sim, the executive there told my brother that the sim will be activated in next 4 hours. I got the sim in the evening on the same day. I inserted the sim on my mobile phone and the sim was working again, but for only five minutes. After that it's not working again. What should i do. I need my airtel number to work again very urgently. Please help.