Hi,
I heard there are many people getting banned recently (me included, I never left bot unattended, so idk how they detected it) but there is a way to get GGG to give you all data they have gathered about you, that includes the detailed reason why you got banned, IP's, timestamps, if someone reported you, if an admin watched through your chests etc.
1. Write them, that because of their ToU you are entitled to receive any information they gathered about you.
if they deny
2. Write them, that the "Privacy Act 1993" entitles you to to receive any information they gathered about you and that you will write a complaint to the Office of the Privacy Commissioner.
if they still deny
3. go to "https://www.privacy.org.nz/your-rights/complaint-form/" and file out the complaint (it doesn't matter where you live...)
It will take some days / weeks but you will have success and if you're lucky, GGG will even lift the ban.