He / she did not answer because they dodgy so-called debt collectors breaking Australian laws in so many ways. But they get away with it since they have not yet been slashed at the knees

I called back the number (07) 5512 2411 and the guy on the other line did not mention the company name

Caller: Unknown

Had a call from this number. I answered & they hung up straight away.

Asked me to confirm my date of birth and address which I refused because they wouldn’t advise me who was calling. Then asked for a difference means of contact which I refused till they would give me a name or company with who I was speaking to, which they didn’t so they ended the call.