Car warranty spam robo-calls from a call center. Returned calls are fed to a voicemail system. Requests to be removed from their calling list go ignored. They call nights, weekends, cell phones, after you tell them to stop, hang-up calls, silent calls, silent messages, all of which are illegal. Report these calls to your phone company to have them blocked or to your local police department to make them stop. Also calls from 307-220-1104.