Don't trust anyone, you're the only responsible for your account safety. Since it's not our fault that you lost your items we can't really help you with this issue.
Closed
Since player isn't insulting neither spamming your chat with the same phrase which is against rules I can't do nothing about it. I recommend you to use /ignore feature.
Declined
I need a video proof for this violation or at least show us in screenshots that the player is casting a spell so we can be sure that it's not a visual bug. Also, in screenshots I can't see player casting "mc" as you state in your format.
Declined
The usage of a nickname which contains alt code results in a 30 days ban not in a 7 days mute.
Please wait an answer in your appeal by the moderator who punished you.
Closed
For this violation you must have timestamps enabled and you also need to disable mature language filter.
Although, player is now banned by me because I now have proofs against him.