Kids access xfinity wifi from neighbors - INFURIATING

I have disabled my xfinity hotspot but we still have a hotspot active close enough to us.  I'm assuming from a neighbor.  This allows my kids to access the internet even when I use the XFi app to shut it all down and pause their devices.  This really ticks me off, Comcast.  What's the point of having all that control when the kids can just hop on somewhere else??  You are making life very difficult for parents all in the name of getting your tentacles out there so more and more people can log on.  It's infuriating!  I'm trying to coordinate with neighbors but the eldery one next door has no clue how to fix it without giving me their login credentials, which I don't want to ask for.  You need to just shut off this feature, please.  It's making parenting life at home very difficult and stressful to manage.  Thank you.