Delete/uninstall the game from your device, change your android id, reboot, use a new google account to install game again -> gives me fresh start every time no problem.
Changing android id alone was not enough, and a new google account wasn't enough either, but the 2 together works just fine for me.
EDIT: Just thought I'd add a few things I've noticed that will get you banned quickly ->
too many final upgrades on buildings (uses a lot of gems)
using a lot of potions or fusion stones (these are meant to be rare)
crafting any epic boss armor you shouldn't have access to ( this gets picked up very quickly imho),
opening too many dpc chests (seems like anymore than 2 or 3 per day gets flagged and checked against source of gems used to purchase them)
too much progress in any 1 event ( arena especially, other players are keeping notes of scores versus wins/losses and reporting anything suspicious to admin )
*Basically all the fun stuff that everyone fiddling with data would want to do straight away lol
Also, when game first came out you used to get a warning & reset account to lvl1 when caught hacking, now you just get banned, heh I guess they're sick of it already