You answer and the line goes dead

Didn’t answer , they didn’t leave a message. Can’t be that important!

I called the number back only to receive a recorded message stating the number I have call isn't connected........I just has to be a telemarketing company!!!!!
I'll be blocking this number.

Knew my full name, seemed to be a call centre (Indian accent, background noise) said he was from some kind of energy company. I said I was happy with my electricity bills and he hung up.

this number called on 9 June 2018 calling me by my name and stating that they were with Energy Saver and that they had obtained my mobile details from the Australian Data Service. When I questioned why would they provide personal details of mine to them and what are they trying to sell, they hung up.

called me and knew my full name, they asked if it was me and I answered yes. then they hung up. can't call back because number is 'disonnected'