I called back number (02) 8488 2497 reached voice mail but did not say from what company.

I had missed calls from this number. This number doesn't leave messages and is difficult to call back. Eventually, based on the comments above I blocked the number.
Today I managed to answer the call (they got through on my work number) and they were from CCH Australia. I have a subscription with them so I was happy to take call but I just wish they left a voice mail or something.

I have for weeks now been getting calls from this number at one stage 4 times in one day and they call every day each week. The caller always hangs up when I answer or I let it go to voicemail and they don't leave a message or they let it get to voicemail and its a silent 4 second message.

Ring briefly about once a week and hang up.

Called and didn't leave a message, block them

caller hangs up when you answer.
they call once a day everyday