Caller: Have a fair idea after having this number traced

Has been harrassing without leaving msgs as to reason for calls for months, has no email contact or hard copy contact just annoying txts and calls. Left only one msg ..to call to settle issue. Theres no issue to settle.
Conclusion: This person is trolling social media to try to find contact numbers in disputed or alleged old debts . Some older than 20 years. Hasnt a legal foot to stand on. Even IF there was a debt after 6 years if no legal action was taken by the original debtor its past the statute of limitations.
You can find the appropriate advice agency contact number and course of action to take to stop them nsw / Australia through online search for your particular circumstance .

I called back number (03) 5610 6250 reached IVR for Milton Graham (Dun & Bradstreet).

Caller: Milton Graham

I got several calls from (03) 5610 - 6250 and (03) 5610 6215, in May and June 2019. I supposed they are both Milton Graham. Recorded machine voice saying call back. Got text messages from them too, said they are chasing money for a telecommunication company which I was a customer and stopped using them with final payment paid.

caller didn,t leave a message today but just said bye .
call made from this : 1;41pm ( 30 / 4 / 19 )

this number > "(03) 5610 - 6250" called Tuesday 2/4/2019. = 8:42am
caller didn,t leave a message ?
background noise with people talking ?
Possible scam - hoax - bogus ?
Maybe part of "ORGANIZED CRIMINAL"
net work ?
Who know,s ?

Caller: Milton graham debt collectors

Used to be called Dun and Bradstreet, changed their name hence why they weren't already blocked

it's an overseas call, made to look like it's in Australia, and the person name they asked for isn't here, I've had this number for 18 years.