Not sure of the number. I don't know anyone in Victoria (03 area code). If they can't leave a message then they can't want me to call back so can't be important.

hangs up as soon as answered - sick of these type of calls

Rang both our mobiles and landline - didnt leave message on all 3 - now blocked

I don't answer unknown numbers. (All family and friends are stored in my caller ID). They call several times a day but never leave a message. If it is urgent or important (eg, official business) they would do.