On PC, players can get banned for using pretty much anything with an overlay, or even updating their graphics card in the background while the game is playing. As per your policy regarding bans, once players been banned, regardless of whether they are guilty or innocent, they can't get back into the game at all, and you will completely ignore any and all requests to even discuss the ban.
This is not okay on any level, and unless this is fixed as soon as possible, I honestly believe that this might kill the game.
You need to give us something to let us know that you are aware of the issues. You need to fix your cheat-detection software, you need to change your policy regarding bans, and you need to undo every single ban that was caused by this.
Also, I know this has been thrown around as a joke in the past but I really mean it, PC players should get free silver for having to put up with this. If it was happening on console, I'd expect compensation, so I think the guys on PC deserve it.
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This could have been done better with a twenty minute warning suspension and a list of offending programs to turn off. MAYBE at worst ban regularly repeat offenders but zero tolerance makes zero sense.