i didnt get what she said?

I called back number (02) 9165 4927 reached voice mail for a charity company but did not say the name.

spam

claiming they're from a charity you give or used to give to.
sounds like spam scamming to me,
"what charity did you give - what's your bank account number?"

Called twice alternate days would not leave message. Just ignored

Missed call, didn't even wait to go through to voice mail. Missed a call the previous day from (02) 9165 4918 which my phone tagged as spam, so probably the same?

I called back number (02) 9165 4927 reached voice mail but did not say for what company.