No solution for iphone users as these number keeps changing every time.
If you are an Andiord user, you are able to block international calls from a particular country (using just the country code and not the full phone number) on an Android phone.
You can do this using the call settings in your Android phone:
1.Navigate to Settings -> Call Settings -> Call Rejection -> Auto Reject List -> Create.
2.Enter the number, or part of the number, you’d like to block (e.g. +4422).
3.Change Match Criteria to "begins with".
4.Hit Save.