It’s what I’ve read on these forums. I’m not sure how fast they handle undermesh reports. Hopefully, they prioritize those, but there has been absolutely no transparency about how they handle reports, so I honestly can’t give you any hard data 
The one thing I know for sure is that posting public accusations against other clans is against the forum rules, so sooner or later a mod will close this thread. That’s why I pointed you towards the proper procedure for reporting, so that there is at least a chance someone will help you.