i just receieved a phone call from this number. Its terrible.

I've also gotten numerous calls from this number. Whenever i try to answer, they've hung up. It is really annoying.

They are Hello Mobile. Apparently their automated dialer calls 13 numbers at once and then as soon as one of those answers they drop the other 12 calls!
You can put your number on the Do not call register: https://www.donotcall.gov.au/

Hello mobile's details:
http://www.hellomobile.com.au/
Telephone: 1300 131 858

we have had calls from this number the last 2 days in between 4 and 5.30 we have tryed to call back but wont go through>Whats the go

I have had several calls from this number over the last couple of weeks. I don't answer and wonder what kind of a company employs people to ring unanswered numbers over and over again.

They are Hello Mobile. Apparently their automated dialer calls 13 numbers at once and then as soon as one of those answers they drop the other 12 calls! You can put your number on the Do not call register: https://www.donotcall.gov.au/Hello mobile's details: http://www.hellomobile.com.au/Telephone: 1300 131 858