I'm sure you already know this but just in case you don't or someone else doesn't:

ESC > Support Desk > Contact Us > Report Cheating

Fill out their form and then blacklist them.

I really hope they add a right click blacklist/report function soon. Because it's a pain having to do this for every single RMT I see. I mean, in the last few days they've blown way out of proportion and they need to get a serious handle on it. Good grief. ><;