I called back number (03) 8370 6289 reached voice mail of a solar company called Gryphon Solar .

spaaaaam.

I'm from Victoria. They always call after business hours, don't leave voicemails and when you call them back the line rings about 6 times and the cuts out.

bloody internet marketers

When I answered there was silence, waited about 3 seconds (my tolerance level) then hang up. Heard some vague noise the split second before I hung up. They didn't call back.