Airtel — sim activation failure

I bought a new postpaid sim yesterday for some official purpose. I was told by he executive that my sim will be activated by the end of the day. But nothing has been done yet. I called the customer support several times complaining about the same but nobody really helped also one of them disconnected my call. Sad to say but pathetic service. The verification agent says everything was done from his end and asked me to contact the person who sold me the sim. Again that person also has no idea what the current status is. I am damn pissed now. And regret on choosing airtel. As i have already paid the amount, either get the my money refunded or get the sim activated asap as i am suffering huge losses.