Wrong Suspended

[Qts42]

I just don't understand why I got banned from for ninja. I went with 2 guild mates to rs25 that was advertised on global chat. We couldn't kill Halion and after 4 tries it was raid end. Half an hour later, the raid leader wrote to me that I would be banned, I asked him why? the answer was that he didn't want to write to me, but in the meantime I was banned the next day. I don't understand this. Please someone help me