Samsung Galaxy S5 Lollipop Update

have the Galaxy S5 after I drop the update it stopped accepting my charger cords it doesn't fully charge throughout the night and it will burn up 80% the battery within one hour my Wi-Fi works normal the speed at which the phone is working seems a little slower I did a factory reset and 5.1.1 is still on my phone but for whatever reason all the functions and everything is going back to normal I called AT&T to make sure that I had the correct update and that it was functioning he said yes....what concerning is as I now have another AT&T update now already in and sitting in running apps under application manager claims that it is version 212.??? when I called AT&T they told me that the last update that was pushed was the Lollipop well my phone already has that so what could this possibly be????

the other strange part yes I've done a factory reset and yet the update still is on my phone

Once a os update is installed a factory reset leaves the latest os on the phone.