I have been getting calls and hang up calls from this number for two days.

I got a call from this number the other day.  I tried to answere it but they hung up as soon as I answered.

just received a call from (03) 9246 4700 again it start last week and i been getting it ever since freak'n annoying.  I rang 1800 726 594 and ask them what is that about and the operator going on crap about it might be telstra letting me know some of their available service or special deal crap.  Anyway i ask her to get my number of the list so hopefully that's the end of it.

If I am near my phone I press the answer button, wait 5 seconds then press the hang up button. Figure I might as well annoy them as much as they annoy other people.I accidentally answered a call from one of these numbers when working from home, thought it was the office calling me. It was someone doing a survey. I told them my consultancy fee is $160 per hour plus GST & I will answer any questions once I have received their payment. They hung up & haven't called back since. My phones are both on the "Do Not Call" register.

I received a call from this number on my mobile also (03) 8831 1600, both only rang twice and stopped

If I am near my phone I press the answer button, wait 5 seconds then press the hang up button. Figure I might as well annoy them as much as they annoy other people.
I accidentally answered a call from one of these numbers when working from home, thought it was the office calling me. It was someone doing a survey. I
told them my consultancy fee is $160 per hour plus GST & I will answer any questions once I have received their payment. They hung up & haven't called back since. My phones are both on the "Do Not Call" register.