impersonation at phone call

This story is about my grandmother. She is 75 years old. A few days ago, My grandmother answered the phone in the afternoon. Nobody is in home except grandma. She spoke to someone who called her. "hello, Who are you?" The man said,"This is me! me!" The voice sounded young man, so my grandma misunderstood he is my grandson. Actually, She have 6 grandchildren(2 grandson,4 granddaughter) including me. My grandma said " are you shinya?(It's my brother name)." and the man responded " That's right! I had an traffic accident!! I heart a boy! I have to pay $10000 for medical expenses. Please pay into my account. My account number is............" My grandma didn't doubt at all because my brother(shinya) lived by hisself then.It's a problem that can be happened. My grandma was upset. She prepared money as fast as she could. When she got to the bank, I met her by chance. I asked her "what are you doing? " Grandma explained me. I noticed he was not my brother because I called my brother at that time. The man who call my grandma impersonate my brother. He intended to cheated my grandma out of money! This fraud called "ore-ore sagi(me-me fraud)" in Japan. Someone who use this fraud target at elderly people.