Tata Docomo — sim card is not detecting

Address:

Tower 3, ZS, World Trade CenterDP Road, Pune, Maharashtra, 411014

My sim card is not detecting in any of the phones that i have tried since last week. I cannot do a manual selection as those options are disabled because of the sim card not being detected. I have called the customer care a number of times and tried to talk to local retailers too, but no one is providing support as the company is shutting down. I even tried contacting airtel as they have taken over tata docomo, but they are unable to find my record in their database. I have used twitter too, but there hasn't been any progress on the issue