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I could use some networking help/advice:

despite being out of town for over a week this month, comcast is telling me we've gone over our data allotment and used 1.5TB this month. According to them, our typical month uses about 600GB

I've changed our wifi passwords, but I suspect that one of our internet-connected devices (air conditioner, robot vacuum & litter box, that sort of thing) has been compromised, and I’d like to try and figure out what's using bandwidth without having to disconnect things in a trial & error manner, but I'm unsure how to go about this

I've got a 7-year old wifi router I've been meaning to replace, and I've been thinking about replacing it; I'd like to be able to see about how much bandwidth each device is using over a time period. How would I go about this?