From what it looks like they may of thought you was an ALT character trying to spy. A lot of times new players get mistaken for being an ALT since so many have done it and abused it to spy on other villages. Your best bet is to explain to the hokage that you are not an ALT and that you had no idea what was going on or like @Average said you can reset your character by going to the account manager npc and maybe try another village if you feel betrayed by how leaf treated. I do apologizes you had to experience this but sadly its a rough game for a new player. A lot of the time you will be accused of being a spy alt.
No. Earth prison is the only earth style jutsu that has a evolved form. Earth walls changes over time but doesnt get an evolved form like earth prison. If I remember right earth wall has 3 levels. Lv1 is 1 wall and then lv2 you make 2 walls and at lv3 which is maxed is 4 walls all around you I think its been a while since I leveled earth wall. Earth prison is the only earth jutsu that resets back to lv1 and changes to greater earth prison.
HITSPARK
Maj's post in Got jailed and then exiled was marked as the answer