If it lasts so long you must be doing something that gives the stalker satisfaction. Or not telling the whole story.
I can't imagine the GM's not taking any action if it was so one sided as you describe it to be. Based on my experience they do take action quite quickly.

Ah, I wish I had a stalker, the ones I had left me alone after getting blacklisted and ignored for a bit. I guess I'm not dramatic enough for them.