Don't answer. Surveys are invasive mechanisms which are used to gather personal information which is then sold to direct marketing companies.
Admittedly there may at times be honest reasons for a survey, but most are not. Until Government authorities regulate surveys, DO NOT ANSWER.

Caller: 0420 109 863

Picked up as I was expecting a call, didn't spoke and turned off.

they played music so hung up

No VM left.

They left over a minute of weird music instead of a voice msg
Now blocked

Calls every afternoon. No message left. Have now blocked the number

Did not answer because it wasn’t a known number. They left a VM at 15:09. Listened to the VM and it was just elevator music.

Caller: Clive Palmer and his dodgy mates

Recorded voice said they're conducting survey into public health/impact of Covid. After two very generalised Covid questions, next questions were all about my political preferences, with a lean to United Australia Party. Typical dishonest behaviour from that dirty b*st*rd oxygen thief Clive. I wish he'd get Covid and croak already!

hung up when i answered the phone so i blocked the number

Government research organisations are exempt from The Do Not Call Register and private numbers.

Rang on a Sunday afternoon. No message left.

called twice, no message so no calling back from me. blocked number

Called 5pm on a Sunday. No message. Blocked

Said something about market research survey - assumed it was a scam, so disconnected - Anyway, we're on the 'Do not call' register.

0420 109 863 rang for a short while - did not recorgnise no so did not pick up - checked it out here and found out what it is - Have blocked no

Scam, Spam, whatever. Blocked 🚫 them

Didnt leave message - have blocked this number

No message - unknown number 0420 109 863
Blocked the caller.

Same as everyone else. No voicemail when unanswered first 2 times, hung up straight after i answered the third.

Caller: 0420 109 863

Both calls on a Sunday. No message. The usual unsolicited crap from some research / survey company no doubt.