this number has been calling 4 times a day for the past three days doesn't leave a message when you pick it up its already disengaged.

Had that number call late at night and middle of day now. No message. Not calling them back - if it's urgent they can leave a message. Victorian or Tasmanian number - not sure which area is 6108, but not Melbourne. Had a different number doing the same thing for over a week several months back. That one was a hangup as soon as you dial and hang up if you answer, too.
Am on Do Not Call list for both mobile & landline. Getting rather annoyed with that sort of thing - sounds like an autodialer that doesn't check if a rep is available. Either way, probably telemarket of some sort.

I am registered on Do not call.  Still get calls from telemarketing
so I suspect this is one too.

Calls at least 4 times a day. When ring back it is engaged and when you do answer they hang up or there is no answer. Very annoying and frustrating.

I am registered on Do not call.  Still get calls from telemarketingso I suspect this is one too.

I to get these calls! I suggest a id phone so you can just leave it to ring out!
Mighty annoying though!