Airtel — SIM owner issue

I purchased two sims from Mayur Vihar Phase 3 in 2010.
1. 9650xxxx86 - in use (Stopped Working)
2. 96502xxxxx - in use

Since then I have been using a 9650xxxx86 sim, now suddenly the sim stopped working, I visited the Airtel Store to reissue the SIM card but they informed me that the sim is not registered in my name but in another person's name, and so they can't reissue the sim to me. I purchased this number after submitting my documents, but the sim has been registered in another person's name whom I don't know. This SIM is used everywhere and even for financial transactions also and it's not possible to purchase another sim card because it's linked everywhere. If I remember correctly then I had registered this SIM with Aadhar also, but I'm not sure. I need the same no as soon as possible, so please let me know how I can get this. Also, I don't know about the other person the sim is registered with.

This no (9650xxxx86) number is linked with my Primary no: 75037xxxxx.

This no is also linked with my Aadhar no.
I have raised complaint to Appleat and Airtel Twitter, but no response from there.