A tracking and monitoring system and method includes a callback engine in communication with a plurality of GNSS-enabled ankle monitor bracelets via cellular/Wi-Fi internet service or SMS text service, depending on availability of services at each bracelet location. SMS text communication may be routed via a relay service. Bracelet straps form electrical circuits by which open, closed, cut, or shorted conditions are detected and relayed to the callback engine. Bracelets include components for detection of magnetic hacking, physical intrusion, software hacking, and GNSS spoofing. The callback engine may remotely update bracelet setting and cause playback of audio messages; bracelets confirm execution with the callback engine. Bracelets include advanced power saving circuitry and notify the callback engine of low battery levels. An administration application allows efficient management of bracelets by law enforcement authorities and may communicate with bracelet wearers via the callback engine or a mobile phone application.