Hey there! You can check a players ban history here, just type a username into the search box and it will show all their past punishments
If you got falsely banned or muted, you should send an appeal here. If you were reported on the forums, if the person who reported it allowed for them to send you the evidence, they will send it to you. If you were banned for something like command spam, that's a chat related offense (even though it's a gameplay type ban), and they should be able to access the chatreport. If they can't find why you were banned, or if they see that it was a false ban, they should unban you and remove the offense from your player history. Hope this helps, have a great day!