Pretty much knew it was a scam when the number came up on my phone as (02) 9099 2767 which is a scam number called earlier today, since blocked. This one actually left a voice message but it was just garbled nonsense, so duly deleted and number deleted.

Appeared to be spam regarding your “electricity bill”. Sydney number. Number blocked

Scam (02) 9099 2766 rang and left a message and they knew my name , after all the data hacks that have gone on no wonder they know your name , number :( I have blocked them

Caller: Energy supply service

Offering Energy supply discounts, unfortunately won't take no for an answer, hung up on caller

Left a voicemail with just a 'hello' against a lot of background noise. Deleted after reading this site.

Unique offer, 'Great deals on electricity and gas' - SPAM

Caller: Unique Offer electrical

Selling electricity deals