The player attacking me has finally responded to me.
I now know why I am being constantly attacked by the player. It is a personal attack, I did not recognize the player. We both did (them) and said (me) things and I was actually temporarily banned for my part (I think a week, not sure, I was unable to access the internet during my ban), I do not know what actions HCS took against the other player.
Now that I know why, and it is not for xp or prestige, I kind of hope the person keeps attacking until they can find peace. 6 or 7 years is a long time to be angry, it is very bad for the soul. I have sent him an apology but I doubt it will be accepted. I hope they get peace.