How do you block a player?

How do you block/blacklist players? I keep getting whispers from a meseta bot seller (PN1499867262). I can't seem to find how to block and report this damn bot! Seeing this reminds me of Old RuneScape don't make fun of me please lol

You have to view their GT and block them. There's no in-game blacklist or friends list. It's really stupid.

@BFGesus omg are you serious? Now I need to disable whisper for it to stop... Meseta bot seller.JPG