A bank account is running in the name of any person , on a fake power of attorney by someone from last 2 years?

a bank account is running in the name of any person , on a fake power of attorney doent, which is not notarised and registered but written on a rs 100 frankin / non judicial stamp paper ,by someone,who is operating this account from last 2 years,without any information to that person, than what action should be taken against this forgery, please suggest.