hung up when I answered

I called back number (03) 9039 6573 rang 5 times then goes to busy tone.

They keep calling me and hang up when I answer. Tried calling number and goes to messagebabk

Unsolicited to my (private) mobile number.

I do not use that phone as a phone so calls are not answered, no message left.

Suspect it must be a sales call as no-one who has permission to contact me has that number.

Keeps calling and leaves no message. How irritating

I missed this call but there have been reports that it is a spam call. Blocked the number now.