Phantom MAC ID shows up in the Comcast data usage meter - XFinity

#1
Phantom MAC ID shows up in the Comcast data usage meter, XFinity-Comcast internet. I have a DPC3939 Gateway. In the comcast usage meter I have a second MAC id shown using data that is not tied to any MAC ID of the gateway or other devices. How can I disable this unkown device. It's series is 1C:1B:68, Arris, not my equipment....
 
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