We are on the 'do not call' register and even have incoming calls from call centre countries blocked, yet they still manage to ring us. It is very irritating.

fake number, rang back, told number unknown, check number again.

She said “It’s about your computer “.
So I quickly said “It’s a scam” and hung up

Scam the scammer, diverted them to my nuisance answering machine, where they chatted to my answering machine for 4 minutes before giving up. Illegal area code for Australia, and 12 digits instead of the mandatory 10 screams scammer with a spoofed number. RA shortens the number searched - 064244652827