If you do not have proof that that person is harassing you they will not do anything and not only from Square Enix it is in almost all games, in World of Warcraft Blizzard where the PVP Open World exists there was a lot of harassment to players. The only way that Blizzard acted with this is when the camping was prolonged and it was possible to show that that person was chasing you around all the maps with a character from the opposite faction.
The difference is that in other MMORPGs, harassing means not being able to play with your character due to PVP systems, harassing in this game allows you to continue playing normally. There are some fixes to the system but those fixes will not greatly avoid the harassment problems of the game, because changing these rules would open the door for any of us to be banned simply for having the bad luck of running into the same person every time.