Airtel
SIM - registration failed

I brought a Six year validity Airtel Prepaid card (9790094121 - tamilnadu) a couple of months before and left it unused. When i tried to use it a day before it says Registration failed. When i inquire Airtel office they told me SIM cant be activated again. I need to get this number back and activated my SIM.

Regards,

Balan.