Airtel — my sim is not activated

Address:

533249

I recently ported my sim from bsnl to airtel, i inserted sim into the mobile on 28 december of last month, but up to now my sim is not activated it's showing no service. I reached the airtel office where i got my sim, but they are saying insert in another mobile, restart but it's not working. This sim number is very important to me, i will get important calls, office calls. Please solve this issue as early as possible. It's about one week but it's not activated still. Resolve this issue as soon as possible