Nsdl E-Governance Infrastructure — Same Pan issued to different person

This is to inform that I Resident of Delhi have Pan card Number BXIPK4346R since 2011 and today I have received call from unknown person from Rajasthan who has same Pan number. His Name, Father name and Date of Birth are same as mine. He is filling ITR since but I am not. I have visited one of your office and they suggested me to go IT OFFICE but did not guide what should I do?
It is my humble request to provide complete process details or resolve my concern as soon as possible. I am continuously facing problem while operating my bank account.