I want to become invisible to the guy harassing me - not a pvp issue

[Perl-anetheron (Perl)]

@Chitinud-cenarion-circle

But I want to disappear. I don’t want him to be able to add me to his friends and see when I am online or /who to find out where I am.

Unfortunately, that’s not possible. Here’s a very detailed guide to help stop harassment in WoW:

Spotlight on: Harassment

While adventuring through Azeroth and surrounding lands you will encounter a myriad of other players. They could be out questing, exploring a dungeon, trying to smash the opposition in a Battleground, defeating a raid boss, or simply hanging out in town. The certainty about an online game is that you will likely be engaging with these other players to one degree or another. Some communication will be helpful, adding to your experience in a positive way. Other contacts may not be so rewarding. W…

Basically, never reply or respond in any way. Report every attempt they make to harass you as Ongoing Harassment.

If he’s messaging others, or saying people are seeing things in chat, then that too can be reported.

But the key is not to reply in any way and report, report, report!