stopped in my tracks with this page

I have the premium Avast paid for program and today this took over my computer,(attachment) the cursor was unresponsive and I wasn’t going to phone the number. Received advice to do a hard shutdown from a learned one and that solved it.
Is this a new crapola or is it an old one? I have no idea as computers are not my language.
I wonder how it got through my Avast defence?
Thank you Gurus.

Even if you did not respond to the message I’d do a full system scan with AVAST after anything like this and probably run another anti-malware sweep using Malwarebytes just to make sure nothing has been sneaked onto your PC.

Ok,it was malicious enough for me because my mouse cursor would not respond to any moves at all and I ended up doing a complete shutdown to get rid of it.

I wonder how it got through my Avast defence?
Because it is not malicious, just a fake message The malicious part come if you phone that number