Wont leave message / they hang up once you call

They called to tell me Telstra internet is down. I asked them how they had my number. They hanged up. I tried to call back it s failed . Scam

I disconnected the call, sounded like an overseas call centre.

Caller: Call centre

The caller was an obscenely abusive man for no reason. Because I wouldn't say whether my phone was Apple or not, he launched into violent and threatening abuse. I hung up, naturally.

Caller: Pretending to be Telstra internet

don't be fooled, they are NOT telstra, don't waste any time, it is a scam

Scam call they say they’re from Telstra and that my IP address has been hacked. I tell them Telstra is not my internet provider and ask them what physical address is the hacking at? They cannot answer. I keep asking them and they get frustrated and tell me to “shut up shut up” then hang up.

Missed call from this number. no message left. tried to call back but says number is not in service.

Caller: Scam

Claiming they are ringing about Telstra internet connection