Happened to my mother-in-law years ago, but the caller said “grandma” and that’s not the term her grandkids use for her, so she knew something was up. Her poor hearing prevented her from recognizing that the voice sounded different.
No money was sent.
My grandkids have very unusual names for me and my husband. They refer to us as their Grandmother and Grandfather when talking to others but never when speaking to us. If I ever got a phone call and someone called me Grandma I’d know it was a scam.