(I have not read your review or the comments inquestion, so I don't know what kind of "harrassing" occurred nor how you reacted to it. But here are some general thoughts)
As a stopgap measure, you can disallow comments on your reviews. If you go into editing mode, there's a box you can tick right under the review. However, that prevents everybody from leaving comments on this review.
Blocking could be another option, but I'm not sure if the blocked user can still see your reviews. (Used to be that they could.) But, yeah, that is what a block button is for.
If you are 100% sure that the other user violated the TOS, you could try to report them via e-mail.
Ignoring the user like autumn iris advised is also always an option -- if they are bored they'll move on to the next issue.
