I'm getting random nuisance calls from numbers not known to me at all hours usually from about lunchtime until around 11.00 PM. I used to answer these calls which claimed to be "Telstra" (Scam), "NBN" (Scam) and "St George Bank" (Scam) but mostly I'd answer and there was only a few seconds of silence before the caller disconnected the call or there was just music. this two to four times a day so now I tell everyone to leave a message because I block all unknown number where a message is not left.