I would contact Comcast and change your password account with them. Most likely your account with them was compromised, or you gave out that information to someone else. (I use my brothers account with Comcast in NJ to watch HBO online here in Fl. My using his account anywhere in the US on a public Xfinity network goes against his totals.) Comcast should also be able to tell you what the activity, and web sites that were accessed with your account. I don't think it was using the Public portion of your modem, or your WiFi router, since you surely would have noticed a convoy of vehicles located in your driveway. WiFi signals have a limited range.
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