I am having a little trouble following what is going on.
Is this correct:
I have ATV4 and use 200mps
You have an Apple TV 4 (HD) and you had a 200Mbps download plan with your former ISP.
but recently I changed internet providers for 63mps
You changed your ISP for slower plan, which is 63Mbps (odd speed).
my ATV4 plus my Freeview+ STB wouldn't work because neither would connect to the internet
Your ATV4, and STB will now no longer connect to your network, or at least they do not have a internet connection since changing your ISP.
yet my other Apple Devices would
All your other devices will connect, except the two mentioned above.
Is everything I mentioned correct?
If so, I have some questions:
Did you change your networking equipment such as your router when switching ISPs?
Have you verified that your ATV and STB is connected to the correct network? My network goes out, like when I am restarting my router, my ATV sometimes connect to an unsecured networked or Hotspot offered by one of the ISPs in my area.
Have you restarted all of your equipment?