[Resolved]  Airtel Pre - Paid — Non-Cooperation in Mobile & Sim Theft

My Nokia 3110 Classic with Airtel Pre-paid sim No. [protected] was pick pocketed in Sayaji Nagri Express on 05 Jan 2009 on way to Ahmedabad. For this I lodged a FIR at Bhuj City Police Stn and further I got the new sim of the same No. after producing identity documents.
My problem starts afetr the new sim got activated, I got a call from an unknown No., on qurreying the caller told that this No. is of his friend who called him earlier same day. I politely and diplomatically got his and his friends address noted with me. Then I immediately checked my phone's balance, which was 160/- Rs less from the time it was stolen. I then went to the Bhuj airtel office where I reside and asked them to provide me the Call details during that period in which the said person has made the outgoing calls from my mobile. But they said that they can't provide me such details. Though I have also given them the copy of FIR they were adamant. Then I told them I am asking these information under RTI act for my mobile, as there is nothing wrong in it. Then they told me OK we will not give you the information here and it will come to you by post on your address and 50/- Rs will nbe charged. Is this right that 50/- Rs are charged for the information ? Can they provide me the information instantly? Till 12 Jan I have not recieved any information from airtel. By getting me late, they are hampering my chances of retrieving my mobile. The person above mentioned for stealing the mobile also has not gone to the city where I contacted since then, and his shop Owner where he worked also suspects that because of this he has not come back to Jalgaon. Pl provide me assistance.