I received a fraudulent message about an accident, saying my mother urgently needs money. They scammed me for 12,500.

I received a message on WhatsApp saying that my mother had an accident and money was needed urgently. My friend's WhatsApp was hacked, and the hacker said this. I thought he was really in trouble and transferred the money. Later, I found out that my friend's WhatsApp was hacked and there was no accident.