These [***] have been doing this Scam for something like two years or so now "WHY" can't they be caught and taken down. The IRS has a post on their official website telling about this going on so they know . It would seem to me they would have the ability to capture and prosecute these people by now.
Good luck with that. US can't do anything because they are in India and Pakistan and the local governments do little. Invest in a call blocker and DO NOT pick up on call numbers you do not recognize.