I called back number (02) 9137 2758 reached voice mail but did not say for what company.

No sound when answering, 2-3 seconds later there is a beep. I like to whisper vulgar things into the phone, its gotten my number removed from scam call lists before

i answered call. they just hung up

Wont leave message and when I called back I got a call centre with a message stating I couldn't leave a message??