Airtel — mobile sim not being issued after a faulty sim

Address:

Chennai, Tamil Nadu

I had a postpaid mobile number with airtel, i converted it into prepaid as i had to travel onsite for 3 months. The sim didn't work when i was abroad. I tried to contact airtel for reissuing a new sim for the number once i was back, but airtel refused to give me the sim stating that this cannot be reissued as i had ported the number from vodafone. I contacted vodafone as well and they said you have ported it, we cant help. This is the number i have linked to aadhar, netbanking and other important government communications. I have also raised a complaint with trai but i have had no response. Can you please help me to get back the sim with my mobile number? I need it urgently and i am not sure how to go about this issue.