Unable to do Apple Internet Recovery

Hi

I am currently using Apple Mac Mini late 2014, and i cannot seems to get Internet Recovery done and it keeps returing 2002D and 2002F errot. I keep telling my ISP see if they block the DNS and they told me they do not block anything. Since I am using 1.1.1.1 DNS on my Wifi Router and it is still does not work at all. Until i totally give up hope! I really do not know what to do. Even though i call Apple up. They say it should work at their end. It would be a complete disaster for having it to work on my mac mini. Some one is blocking the DNS to my mac mini and I cannot do any Internet Recovery done at my end.