Who called from 4049025818

A female left a message like they think they know me....

"Naina, really? Or is it Nina?"

They did the same thing they didnt say anything

Called cell phone.  No message.

they keep calling my cell phone they leave no message and when i do answer noone says anything

i assume they are hackers and trying to get something from people who would take it i reported them to the federal trade commision i as harassers