Guest network disabled, but still on?

I disabled the guest network in my xfinity account but I can still see the usual "xfinitywifi" network is active when I run a scan from my phone. It's definitely my device transmitting it. It has the same MAC prefix as my main networks. I haven't tried connecting to it since my neighbors' guest networks are also transmitting and I can't force my phone to connect to this one and this one only.

Why is this network still active even though I explicitly told it not to?