Many of these types of Telemarketers use Majicjack and get a US phone number in the area of their choice. The MJ then can be used from India. Not particularly high tech.
Calls constantly . In the beginning I tried being nice, then I tried humor, than I tried rough stuff. Nothing works and our Government is busy helping illegal aliens--- So no time for frustrated tax paying citizens . Mu advoce block th ecals or just do not answer.