No message left, likely scam caller

I called back the number (03) 8399 9133 but was routed automatically to an ivr

No message when rang back no ring tone then automated voice requested me to leave name and number i have blocked number

Likely Scammer Blocked number

Rang aoof without leaving a message; suspected robot

Caller from a firm called Charity Choice wants to ask you some questions about your opinions on donating to various charities. Caller made the questionair sound so easy.
However not sure which organisation your answers and comments will be sold to.
Hang up straight away as it sounds like a scam.

no message=blocked number

Likely scam, no message left