I called back the number (03) 8376 1293 and reached vm that said I reached ARMA Group

Caller: Some Mercantile Agent

Called and hung up
Called back several minutes later with a blocked number and was told it was a Mercantile Agency but it was said so quickly that it was not possible to be sure of the name - thought it may have been Australian Mercantile Agencies or similar

Rang, I answered then they were silent for a few seconds and they hung up

said i have an overdue account but didnt specify what it was for and that they needed to transfer my call to the next available server

Filthy Scammers immediately block!!

Rang and then hang up

Caller: Debt collector

Rang for 2 secs then hung up. Blocked.