I'm sorry you're being harassed by someone. This unfortunately is the Localization section and is meant to ask in changes of in game text. I.E spelling and grammar mistakes or oddities. You could try reposting this in the general section or in the User Interface section of game play. Sadly you are not the only one to have this happen to them or find out that unfriending someone in game doesn't work the way many people assume it should or would. The devs the rare times they've been asked for such a change have balked at the idea. Giving a flimsy excuse of not wanting the person who got unfriended to become upset. I'm guessing it's due to there not being a lot of harassment or stalker type behavior in the non NA/EU side of the community?