Airtel — my airtel no [protected] got deactivated

I have airtel sim [protected] the number was disconnected on 01/10/2017 due to non-usage of 90days.
From the date of deactivation i have contacted airtel relationship center and also send a mail to [protected]@airtel.com they only make a fake promise daily that they will reactivate my sim but i still now my no not reactivated nd suddenly with rudely arc saying sim no longer available for you and i send a mail again to [protected]@airtel.com they still they are saying same thing so kindly solve my issue such a important sim that one