Airtel — my sim is blocked since jan 2

Its been a while that my sim got blocked and i can't use my number. I've been using this number past ten years. And i took the sim from a mobile shop where i gave my details, but instead when i enquired with your customer care i get to know that it was not in my name the ownership remains. I want to get that number back.
And please make sure that if someone has such a situation they can connect you via any other network also. You only have a number which your network users only can contact.
I need a reply as soon as possible