I called back the number (03) 5610 6129 and reached vm that said I reached Milton Graham

I suspect this is a debt collector as the new number I got had been used before and that previous person had all kinds of debt people after them..

When answered there was an immediate vm saying it was Milton Graham and to call back a number (which I didn't write down and would not have called back in any case). Suspect spam as I've no idea who Milton Graham is and the number is interstate.