@rnandanrao 

Unfortunately, if you have clients changing their MAC address then you will need to look at alternative means, the Deco is not able to prevent changing as that is done client-side. Since you have users going as far as to literally change their MAC address, then you need to kill the Wi-Fi network in general.

The Deco app can not hide both of the main networks so you can look at enabling the guest network, have the clients use that then disable the guest network when wanted.

The auto-add to a parental control profile has been mentioned by other users which would be a good feature.