Yes, happened to me too.
Last month we had spikes of 280GB in one day, our usual usage is 1GB.
This month again a spike of 75GB when we weren't at home.
This has all since happened we moved to a new modem.
Next time I call Rogers I will be mentioning that I will make a complaint to the CRTC.
I'm fed up with customer service reps following have you changed your password, have you shut off the modem, have you been using P2P, have been using netflix a lot (Impossible to watch 250GB worth of content in a day), etc, etc, script.