@erador moderators still just a regular players, someone might not want to get involved, someone might be offended by not polite tone. If everyone ignores you in DM you can try to escalate it in global chat. This is a major community issue if there is not way to dispute a ban and it should be addressed accordingly.
PS: This is just my thoughts. I might be totally wrong, since faf obviously suffers the same issues as any other small gaming community.