Unfortunately there's nothing that can be done about this via the forums, as that constitutes naming and shaming which is an ingrained rule on the RSOF. So any threads that could be made informing people of that issue would fall under that rule.
I realize this is not an ideal situation, but concerning what is and isn't allowed on the RSOF, the rules are pretty clear on this particular thing.
If you've asked for an answer from the clan and the reply wasn't suitable, I'm afraid nothing further can be done via the forums.
Community Manager for Jagex