I called back number 0450 755 234 rang once then gets disconnected automatically.

Electricity scam

unsolicited mms texts

When calling back, “Optus advises the number has been disconnected”.

It was a disconnected number when I called back so definitely a scam

Who did not leave a message.

Electrical scammer, hanged up when I ask for his name, company name and why he called me

Hung up as soon as i answered.. Another scam.

Comes up as 'Ant' caller id, they have rung multiple times, already blocked.

The lady asked if I was Vanessa and I said No and she replied thank you have a nice day and hung up!
Tried calling the number 0450 755 234 back, rang once then gets disconnected automatically

Caller: Scam

Scam call

Hung up when I answered. Suspicious.

Scam

Just keeps calling. Telemarketer another one to block.

Caller: UNKNOWN

Did not answer as not on my contacts

When calling back, “Optus advises the number has been disconnected”.

Unsolicited phone call "Compare your rates" or something to ask about comparing energy bills