Fraud

When I was a high school student, there are many 'voice fishing' fraud cases in korea.
This fraud is extort money from the people by phone.
First, they said 'You owe a lot of money to the bank.'. They extort money from the embarrassed people.
Frist time, they don't think that they're scammed. But they are embarrassed, they already deposit some money unconsciously..
The victims want to the suicide because of money.
Second, they said 'I kidnap your son or daughter.'. They extort money from the parents.
The parents don't trust it, but they listen to child's voice. It's just pretending to child's voice, but the parents are embarrassed.
When i was in high school, my friend's mother came to the school because of this fraud.
There are still many this fraud cases.
Nowdays, this is changing another fraud, many people are scammed that. I want to  prevent of this fraud.