ConnectSafe blacklisted my Smart TV

My Smart HDTV (MAC address 1C-5A-3E-FD-04-F9) seems to have been wrongfully blocked by ConnectSafe DNS server. All other devices can connect to the internet using the ConnectSafe DNS server IP address. Also, if I use my local ISP's DNS servers instead of ConnectSafe's, the Smart TV can connect. It may have been incorrectly reported as a threat device. I have had the ConnectSafe DNS servers set up in the router for a very long time already, and it never had any problem whatsoever until now. Kindly assist in removing it from the blacklist because this is the only device used by the elders in the house. Thank you.