My friend received a call, and I recognized from the way he spoke that it was fake.

Nowadays, many people form circles on dating apps where they create fake accounts in a girl's name and then share the number. Later, they call from another number and claim to be SI or DSP officers, saying that a girl has filed a case against you. They immediately start asking you for money. Don't panic and don't give them any money. If you want, you can report them or block them. You can turn on your recording and file a case against them.