@Tarlak333 

There are several things they can do to get past the controls.

Another poster reported that a power cycle of the router bypasses some of the controls.

they can also change the MAC address so the controls do not see them.

Some have reported that a VPN can be used to bypass some of the controls. 
If your network has APs or Extenders and depending how they are used, they can get around some controls.

There may be other ways. 
 

you need to find out what they are doing and plug that hole.

Depending on your model options, you may be able to put them on a guest network and use the guest network controls. 

  @ArcherC8 

Kids (three) aren't doing anything to bypass the system, this hasn't worked since day 1.

- Router has not been power cycled.

- PCs are hard wired to the LAN, and the kids Tablets are on the routers 5G WiFi (all devices are using static hardware MAC addresses.)

- There are no VPNs in use

- There are no APs or range extenders in use

Please help or tell me how to receive a refund for this non-functional service.

-Tarlak333

  @Tarlak333 

I am just a user helping others.

You would need to contact TP Link support directly bia email or phone.

  @Tarlak333 

Understood, thank you for your time!