You wrote about scammers calling pretending to work for System Mechanic. How do these people know I have System Mechanic? Who gave them my phone number?
Rita, the scammers don’t know for sure that you have System Mechanic and likely no one gave them your number. They call hundreds of thousands of numbers randomly, hoping to hit on someone who has that product. It’s the same technique scammers pretending to work for Microsoft use. They have no way of knowing whether you have a Mac, Windows PC or an Android tablet. They just hope to hit someone with a Windows computer. Scammers also make calls impersonating other security software, so if someone calls your home saying they are from Norton, McAffe, Kaspersky, AVG or any other security service, don’t believe it. These companies DO NOT call you at home. You have to contact them.
This works much like the scammers that call and tell people their grandchildren are in trouble while on a trip and need money. Not everyone has grandchildren and most people won’t have a grandchild on a trip. But all they need to do is hit a few people for whom that scenario rings true.