[Resolved]  BSNL Prepaid Service — abusing calls from unknown id/phone

Sir, since 4/5 days i am receiving extremly abusing calls from unknown call i.e may be from i-net computer. When i asked to my local bsnl authority to give the detail of the caller(place and name and adress) they simply refused to give and say go to police. As i am a customer of the bsnl, they are suppose to give the detailsof the customer or they should not pass such massage to me. Kindly advise what shall i do?