<<< I don' know why they are not doing anything in the US to block these scammers...etc>>>>>

Imagine if your will,   almost 350 million people in the US with over 500 million+  telephones,  with calls incoming and outgoing from each,   and then include all of the foreign phones calling into the US.   Consider that most scams originate from other countries,  most of whom are hidden in basement boiler rooms,  and run their scamming operations with police bribes and their government's blessings.  To Run these scammers down it involves Government to Government diplomacy, co-operation and certain protocol proprieties with these Governments,  who are totally unfriendly to the West and is considered jobs by their governments and part of their economy.  Now, consider that each one of the over 300 million people and over 500+ million telephones operating have not submitted a list of those calls that are acceptable and unacceptable to each and every one,  nor does the equipment exist to instantaneously decide which calls each of them want to block or let pass.  There are many ways that have been suggested on this forum but most still maintain that Education of the public and well targeted drone strikes is a step in the right direction.