I called back number (02) 8294 2302 reached IVR for a company called Energy Locals.

Called me in response to my email regarding my account.

Caller: Energy Local

Feb2020, nsw gov switch website estimated Energy Local as the cheapest for my electricity alone. Low usage about 720kWh per quarter.
However when I talked to them about switching they could not come up with thesame estimate as the gov website. There is a complication that they have a membership fee which may or may not be included when you first get a estimate.

Caller: Energy Locals

I went through the service NSW site to compare energy and chose to transfer to Energy Locals, it was them trying to finalise the change over. Definitely not spam, answer the call and save money :)