Hi Prale74
Let's restore some of that control back into your home shall we?
If you check Shelly's comment https://crowdsupport.telstra.com.au/t5/Modems-Hardware/TG797n-V3-Modem-Enabling-Access-Control-Option/td-p/221457 you should be able to have all the control you need.
Let us know if you need any further assistance.
Kind Regards