I Have been getting calls from this number and then they hang up . i return the call and it is always a engaged signal

keeps calling here too - when answered no-one speaks back but can hear activity in the background - telstra say they can't check the number but that it may be a telemarketer

calls every number associated to me, my home and my business - all at the same time

this number called and hung up when i answered, what a waste of time

Need to know the company

They just called me too.
I wonder who it is.