They are tele marketers.

You must have had your, email recently added to one of those stupid annoying survey websites.

Telemarketers

I to rang back and got answer machine no idea what company

My iPhone identified this number as coming from Craigieburn Victoria but it was clearly from overseas and they are selling electricity supply for a 50% discount for the first three months and 30% thereafter provided you pay your bills on time. 5cents feed in tariff if you have solar panels. When I refused to provide my driver's licence details or Medicare card number the call was terminated.

Returned call but ansaphone clicked in immediately - suggest telemarketer

I also called back and went to straight to answering machine but didn't say where they were from

I am on the Do Not Call register

I called back number (03) 8364 8924 reached voice mail but did not say from what company.