to make story short , they offered to help me and asked for my tv MAC , i was able to find it and i sent it to them, few minutes later they asked me to refresh the app and booom all channels were there ! so did they access my tv remotely ?

No. The app on your TV contacted them with it’s MAC and their software authorised it.

and can anyone have my tv mac mess with my list ,,

No.

and if one day i want to change provider can any provider block my tv mac ?

Yes, but only for that provider. There’s no central block.