Hi.im playing this game too. And i found out some work around with the banning issue. Clearly, if you got banned, you can't reopen any account into your device with the previous banned acct. This is my work around and it worked for me for many times.
1. Easiest way is to reformat your gadget or unit. It will reset everything. Then you can start new acct without any issue.
2. Erase your game, game folders and all of the files of your game.
you can go to device manager, look for folder named android>data
Look for folder named com.naturalmotion or any folder with the same name format. Erase all of it.make sure no folders like that exist.
Create new email, remove old email that was used for the banned account.
Then, start your new game.
That's it
3. This is the most and the latest work around im using. If you dont want to reformat your cp or gadget, install parallell app. from playstore. Its the parallel app with the violet icon and a smiley inside. You just need to clear all the game folders, reinstall your game.
DO NOT OPEN YOUR GAME ON YOUR ANDROID GADGET. instead, open your parallel app, add the game and google play games inside the parallel app, and ALWAYS OPEN YOUR GAME inside the parallel app.it works for me and my friends. im playing two game accounts with one gadget using the trick.
Hope this helps.
If you got any questions about the game,feel free to ask . Im playing this game since they launched it.