If you're able to, you could try to connect to another server using your VPN. Otherwise, you may be able to contact one of the mods through the Discord channel.
Honestly, I am not sure whether this is the right place to ask this question. I'm only here because I noticed your post and had a sudden, similar issue. I've got a feeling that it is a technical problem, as I am pretty sure that I did nothing against the rules in my case and the problem only occurred as I tried to log on the other day. Would seem odd to me to ban people while they're offline without any warning or details a