I called back number (03) 9923 0613 reached IVR for a company called Select Your Energy.

Making claims to be able to pursue a discount on energy bill of at least 24% even when under contract.

Very annoying. Would not answer direct questions.

Spam

called - answered - they hung up, thirty seconds later another call from a unknown no. who promptly hung up.

Keeps calling but when I answer it hangs up. Very annoying.

Keeps calling. Spam

I have never given my number Telstra must be given my number out to a third party wine selectors and energy companies

spam

Keeps calling
Pretty sure it's spam