Caller: Charity

No message left.
On calling back, there is a recorded message stating the missed call would be from a charity either seeking support, noting you have supported previously etc.

I called back number 0490 291 258 reached voice mail but did not say for what company.

I called back from the landline at work and reached a voicemail that said it was a charity i may have given to before! Didn't seem to have a name, feels like a scam and blocked the number going through to my mobile phone.

Caller: Red Cross

Received a call from Red Cross asking for donations, but I already donate. Told them it's odd they are calling from a mobile. They also called my work number, which I never gave Red Cross. I told them if they really were Red Cross to send me an email, and they told me they weren't able to. Seems suspicious.

Called multiple times over several weeks, and reached voicemail but did not leave a message,

The caller left a 2 second voicemail which sounded like call centre background noise.