Caller: I don’t know

This number called & hung up when I answered.
I returned the call and they hung up again.
It sounded like they were in a call centre.
I messaged saying ‘was it a wrong number?’
I called again and when I said ‘you called me and hung up and I called you back and did it again- was it a wrong number?’
She said ‘are you the person named on the electricity account.
I said I don’t have a house.
They said ‘sorry to bother you.’
It’s a concern that they used their personal number from a call center.