Airtel — SIM card is Dead

Dear Airtel, My airtel number [protected] has been suddenly stopped working, it has been dead from last 2 days. I tried contacted airtel customer care, but haven't been able to receive any response. This is a pathetic airtel customer care service and I am not getting any response. Please activate my sim again. This number is important to me as it is associated with my all transaction and interactions. I have been using this number from last few years. I do not understand, why Airtel is taking fun in loosing customers like me who has been with airtel from last 10 years. Please take action as soon as possible. Best Regards