Many smart TVs need a firmware update for them to work right. Call in and tell of the problems and have them check your firmware version and address the issues you noted.
I just bought a new Samsung smart TV model #UN55KU6290 and I'm having problems with the remote. Every time I use it for anything other than power a message on the screen says "not available". I have a Comcast box connected to the TV so I can change channels and volume with that so it isn't a huge deal but it is annoying. I can't use the Smart TV features without getting up and toggling the button on the back of the TV, and I haven't actually attempted to use that button to sign into my accounts for the different Smart TV apps, like Amazon. It's not the easiest button to use so I don't know if it will work for that. Is there a way to fix this? I'd just really like a usable remote. Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic