I think that he could lie about whether or not he contacted the police. You don't mean "connected the police", right?

Whether or not the police become involved in entirely up to the cultural norms and their rules. Why would they trust an anonymous voice over the phone? If you believe that the police will act on it, then I'll file a complaint against you, and the police will automatically believe me...right?

We never witnessed anything. We just saw text on a screen.