The Netherite wasn't on me or in my enderchest, it's not in any of my normal chests. Where was the netherite found. If it wasn't found, then how can you ban me?

The proper ban appeal guidelines can be found in this thread:

Ban Appeal Guidelines

It's recommended that you follow these guidelines when posting an appeal, as they help clarify things for the staff handling your appeal. More importantly, they also help protect you as a player from saying things that might undermine your appeal. (Such as a blatant admission of guilt.)