@faafaafuey,
Wyzecams constantly transmit some data over the internet to WyzeHQ, even when they’re not sending a video stream for remote Live Viewing. The transmission is part of a ‘heartbeat’ message that keeps the connection between the cam and the Wyze servers alive.
Others have measured this background data flow, and reported packets being sent at a rate of 3 pps (packets per second), with a total data flow of around 6.5 MB/sec. Other reports have indicated a heartbeat packet flow, approx every 3.5 seconds or so.
The constant flow of heartbeats from your seven cameras may explain your Verizon overage messages.
See this thread for more information.