It would be the FCC's largest fine ever, and targets a firm that made over 5 billion calls in three months, enough "to have called each person in the United States 15 times," it wrote.The operation is run by Roy Cox, Jr. and Michael Aaron Jones via their Sumco Panama company, along with other domestic and foreign entities.In July of this year, the FCC issued its first ever "K4 Notice" and "N2 Order" directing all US telephone providers to stop carrying traffic related to the car warranty scam calls."This resulted in a massive, 99 percent drop in the volume of such calls since June, according to [spam blocking app] RoboKiller," the FCC wrote.Robokiller advises users to avoid the calls in the first place if possible, not follow prompts, and above all, never provide personal information like banking details."