I called back number (07) 4807 6407 reached IVR for a company called Dun & Bradstreet.

It's from Brad and Dunn Street (debt collectors) they'll leave a message asking you to call back on 1300 032 050

debt collectors, shadow chasers, stone-squeezers, warnies (leg breakers), butt reapers

Came up as a Rockhampton Landline Number

Answered & it was heavy breathing.
Came up on my mobile as Rockhampton.

They also have a mobile # both blocked

Dunn and Brad St

I called back number (07) 4807 6407 reached IVR of Dun & Bradstreet debt collection.

Ask for personal info and they will not say who they are or who they work for

Attempting to obtain personal information - full name, date of birth etc. without disclosing who they were or why they wanted it. Declined to provide - hung up.