I dont doubt it is the FOP --- just know it does not do any good to tell them to stop calling and to remove your number from the system because I don't know for sure that there is a system
they have called me on my house phone at least five times in a year and a half.i have told them to leave me alone I answer it to see if it is a wrong number, charity or whatever and then i go online to my phone account and block the number.