I called back number 0404 756 720 rang 5 times then goes to busy tone.

I also got a missed call from this number. They didn't leave a msg. So I didn't call back.

sick of it

This is from a Vodafone mobile phone account. They call non stop and don't leave a message. Don't call this number back there are various schemes connected to missed mobile numbers.

don't wanna know

Had a missed call, called the number back and they said it was in regards to an inquiry I had made online to get my superannuation sorted out. Told them I haven't made any such inquiry and was told they would take me off there list. They were not pushy or rude. Seems like a general cold/marketing call.

Spam call

I called this number back and it rang out