After many players use bots and cheats to play Pokemon GO Niantic - the developers issued this statement...
After reviewing many reports of in-game cheating, we have started taking action against players taking unfair advantage of and abusing Pokémon GO. Moving forward, we will continue to terminate accounts that show clear signs of cheating.
Our main priority with Pokémon GO is to provide a fair, fun, and legitimate game experience for all players. If our system has determined that you cheated, then you will receive an email stating that your account has been terminated.
However if you've had your account banned and you haven't cheated then here's a link to Niantic with a link to contact them...
http://pokemongolive.com/en/post/cheating-bans/
Here's the link to their support page...
https://support.pokemongo.nianticlabs.com/hc/requests/new?ticket_form_id=233187
