Teleport hack and i cant see /s chat even my words

[Blackpetalr1demololjk]

Hello

Im in trouble when i log in to this game i cant write to /s chat and i dont see others writing to chat but i can write in /w And i get ban for teleport hack i cant unban it for free but i always get ban i cant play I nerver used any hacks i dont know why this thinks i use it. Pls help me i dont know what to do but i want to play on this server, this is my favourite server.