Did not pick up this call. Redialled to find number is disconnected

I was on another call and couldn't answer. I rang back 10 seconds after it stopped ringing and a recorded message said, "The number you have called is not in service".
Obviously scammers.

They left me a voice message about a survey. I pressed 3 thinking I've deleted it, but had to press 3 again to really make sure I deleted it. Worried about whether I've consented to something :(. Looked up Australian Research Centre number - I think this is a spoof number.

Caller: Australian Research Center

Survey call from "Australian Research Center".

Answered and nobody there. Must be a scam number.