I had this happen to me today as well. I did a search for console commands and was flabbergasted that /decline did not work for friend requests! It only works for Party requests! RMT accounts have figured this out and are taking advantage of it!

With this new tactic when I right click on their name after they have submitted their "Friend Request" the only options I have is Accept Request and Send Tell. I should be able to right click the UI Friend request or right click their name and decline there.

Would be even better if there was an console command like /declinefriend so I can macro it. I like making it a 1 button affair.

I regularly submit RMT activity through Support/ In game Cheating. but there are just so many! And while this IS the offical way to report RMT. It is dishearting to never know if SE ever reads these reports.