Airtel Sim card Deactivation Problem.(9178681881)

Hello,
       I Shashikant have been using this number for the past four and a half years and i just got to know that my sim card has been disconnected  due to "NON USAGE" and the number has been recycled.I have validity on the prepaid sim card till December 2029 and even if the connection was being disconnected i think the customer should have been intimated at least in the first place rather than doing it without even letting him know.Moreover now coming to the usage part..I agree that there has not been much outgoing from my mobile phone however if I'm right and this does exist in your records there has been incoming usage on the telephone till 25th of November,So i really have no idea from where the 120 days of non usage thing came into.I tried contacting your customer care and to be frank...the words rude and unhelpful aren't the right adjectives to be used for the way they spoke to a customer.All i have been hearing from your customer care executives is that the number has been recycled..I mean how can you go ahead and do that with out even informing the customer and the worst reason i heard the first time i called regarding this issue was that the documents were not proper..I hope you do look into my case and help me out with what has to be done rather than once again give the same reply that the number has been recycled due to non usage.