This might be iSelect insurance. I used their online tool and keep getting missed calls from this number with no message.

rang and hung up

Keeps ringing but leaves no message. Call back and get a message that this call will be recorded but doesn't say who it is so hang up.

Caller: Iselect

It's iselect. Sometimes they pickup

This number called me along with about 6 other mobile numbers over the past few days in hour intervals starting in the mornings till the mid afternoon very frustrating as no voicemails were left

I called back number (03) 9007 7004 spoke to a guy but did not say for what company.