You can block these numbers by using the Group Block setting in the Advanced Settings page of the app. Group Blocking will block all incoming calls that start with the number prefix that you enter.
Related FAQs:
What is Group Block and how do I use it?
How do I block Restricted, Private, Unknown, or Anonymous calls with Call Detector?
How do I block a number by name?
What is the Do Not Disturb feature and how do I use it?
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