I didn't answer. We have a silent number. I phoned the number back. A man with poor English (not Australian born, Asian?) answered and said thanks for phoning back (nice try). I said "Who are you". He said he with a solar power company. I said "Not interested sorry" and put the phone down. So his call to our silent number was unsolicited and unwanted.

Didn't leave a message

Phone didn't ring as it reported it as spam. Went to voice mail didn't leave a message.