Apps installing on its own

Don't know about Samsung apps, but check for DTignite in your apps, make sure you include system apps...disable that. That will put apps on your phone automatically. But I doubt the Samsung ones
 
They're only going to do it once based on a Single account sign in....just uninstall/disable them. Same thing has happened on Note 4/5...apparently...Samsung this Hancom Office is a big deal...and it's fine...but I have an office 365 license :)
 
I have DTignite disabled, but, even so, I did see those 2 apps, mentioned previously, installed on their own, when I woke up this morning.
 
I can't even disable DT Ingnite. All I can do is force stop it but it is likely to come back after a restart.
 
Disable Galaxy apps using Package Disabler Pro, then uninstall updates for the offending apps and disable them as well using PDP
 
I can't even disable DT Ingnite. All I can do is force stop it but it is likely to come back after a restart.

I pretty sure you are Verizon. You can disable, I did.

Settings>Applications>Application Manager>3 Dots menu>show system apps>scroll to DT Ignite>click and click disable