I rang back the number 0412 808 401 once but got disconnected

Call centre. Answered but heard call centre noise in the background then got cut off. Called back, rang once and cut off again.

I called back the number and it was disconnected.

Scammer saying you signed up to be a mystery shopper and wants to confirm details.

My Samsung identified this number as possible fraud or scam.
I just blocked it.

Caller: Mystery shopper

Foreign lady advised me I had registered to be a mystery shopper and she had a task for me.

Advised her to remove my details as I could not recall EVER registering.