I have BT Call Protect. I have protected myself from unwanted phone calls by not receiving "Withheld", "International" and "Unrecognised" numbers.
On three occasions over the last couple of days I have received these phone calls from 01224 17646, 01536 85744 and 01328 93135. These are scam numbers purporting to be from BT needing access to my account because of a supposed security problem.
These numbers are not legitimate telephone numbers. They are "Unrecognised" numbers.
Why is Call Protect allowing these numbers through?
As you say, they are numbers, albeit spoofed, so are not "rejected" by Call Protect.
One of scammers ways round Call Protect.