What do you exactly mean with " was defrauded through a listing on Google maps" ?
A legitimate listing was claimed by someone that it is not the owner?
Someone created a fake listing?
Different situations require different actions, that’s why it is important to be very clear in the question.
In the first case the issue should be reported (by the business or on behalf of the business) in the Google Business Profile Help Community . The business also have the possibility to claim to himself the ownership of a stolen business