A technician coming to work at our building tried to call me several times on our Shaw landline at around 0800 this morning.
He got the error message "Not available" each time.
Is this the message he would get from Anonymous call blocking, or Spam blocking?
On your Shaw phone, dial <star><six><zero> -- you can "block" up to 32 specific numbers, and you can turn this off, temporarily.
Also, through "My Shaw", you can view/change those 32 numbers.