[Resolved]  BSNL — Call diverted to my mobile from an Unknown mobile number

Dear Sir,
I am a user of BSNL Mobile (Excel) Prepaid Number from last few years. My Mobile number is [protected]. This number was issued to me when I was an employee of Birla Institute of Technology, Mesra, Ranchi. Presently I have shifted to Jamshedpur and serving as Engineer (Design) at Indo Danish Tool Room, Jamshedpur since March, 2009.
From the morning of 19th May, 2009 I am receiving diverted calls from A BSNL Mobile Number [protected] belonging to some Mr. Bablu Singh, Resident of Bhagalpur (Information collected from those who are making calls).
The above fellow is not known to me from anywhere as far as I remember and knowingly or unknowingly some how he has diverted his all calls to my BSNL Mobile Number [protected]. I had talked to the BSNL Customer Care but they showed there inability in helping me out in this regard.
I am in great problem due to this because a number of people are trying to contact that particular number continuously and all those calls are coming to my mobile number. This is disturbing me a lot and presently I have been forced to switch off my mobile number.
I am a very old customer of BSNL and hence I do not want to close or switch off this number.
I have submitted a grievance to BSNL today itself.

Sir my Query is:
How can any one divert his calls to my mobile number without my permission?
I feel that before conforming the services of call divert to any customer the service provider should ask the receiver first.

Please also guide me that how my problem can be solved .

Thanks & regards

Pankaj Kumar - (Mob. No. - [protected])
Engineer (Design)
INDO DANISH TOOL ROOM
M-4(Part), Phase-VI, Tata Kandra Road, Gamharia
Jamshedpur-832108
E mail: [protected]@rediffmail.com