MAC Address Filtering is Not Working

Hello,

I have a teenager that is using MAC address spoofing to circumvent the "device pause" featured I enabled for his devices in the Xfi App. I have repeatedly changed the WiFi password, hidden the SSID, and disabled WPS but he continues to be able to find and log onto the network.

I have MAC Address filtering set to only allow devices to connect if the specific MAC address is listed, and yet he is still able to connect to the network.