Airtel — reactivating a deactivated number which was originally aircel and ported out years ago

I bought an aircel number back in 2010 and later ported to airtel postpaid in 2014. I tried converting it airtel prepaid in 2015 and provided the service center all the required proofs and the costs for converting. Few days later when it didn't get converted, i inquired again and they said its in the process and made me pay more money. Meanwhile i had to go out of country and when i inquired after few months, i was told, something went wrong with the process and now i was made to pay the postpaid fees for these months i was out. Again after paying all the fees and trying to have it converted, it failed again. As i was out of country, i couldn't get hold of the service center guys and my number stopped working (My sim was in india itself). When i contacted airtel (This time their email support), they said, my number was inactive and i had to pay some due for it to be active again, which i paid again. After the payment, when i inquired about the number, they said, i have to go to customer care center and pay some required fees (Activation fees) and get the number and is subject to availability. And when inquired at the customer care center, they said the number is deactivated and is with 'aircel' now and 'airtel' cant do anything about it.
After aircel filed bankruptcy, there aren't any aircel centers and neither is their customer support working. I need help on getting my number back.