I have a company phone and don't answer unknown numbers. This number has called multiple time and does not leave a message.
I've also noticed the number is part of an organisation or group as I've also received calls from the same number but finishing in 20, 27,14,16,12.

I have got multiple calls started with 02 7234 or 02 7235, never pick up and assume they are scam calls.

Scam call, they are checking to see if your number is active. Don’t answer. Download Truecaller (for free) and it will tell you if calls are spam, scam or suspicious

Caller: Trying to sell solar

Would not take no and kept calling back this is harassment

Similar to (02) 7234 2466, spam caller

Assuming it’s some sort a scam as when I answer they hang up.

my android phone flagged it as "potentisl fraud"