I missed a call from (03) 9112 5975, when I called back I reached voicemail for Oz Green Homes

Caller: Energy Sales Company

Electricity sales company called wanting to come and to change all of my lights for free. I explained I was locked into a contract but that didn’t seem to bother them. I said I was busy just to get off the phone and they asked if when is a good time to call. I must’ve said after 6pm because since then I’ve gotten calls after 6pm 7 days a week!
The numbers vary here are some of the combinations I’ve been called from:
(03) 9112 5975
(03) 9112 7957
(03) 9112 8009
Oh and if you call back the numbers are all disconnected. They use internet phones which are one way lines.

Caller Did not speak. Caller hung up after I said "hello" for the second time.

Caller: Aus Green Homes

I received a missed call and Truecaller app shows Aus Green Homes. No message left. I don't give my number to anybody so no idea for the call.