Yahoo Local Anonymous Negative Rep

Where do we go to get our reputation back?

[FlwrLdy]

Our local business' reputation was anonymously dinged by someone on Yahoo Local. There's no actual review, no identity of the person making the mark, just a reduction from a 5-star rating. Our site show X reviews, all with 5 stars, but X+1 ratings.

We have an excellent reputation in our community and strongly suspect a competitor to be responsible for the blemish since family members of this competitor have written some of their own reviews (and foolishly used their own names).

We've tried contacting Yahoo to no avail. Does anyone know of a way to refute - or even better, have removed - a negative anonymous rating?

We don't want to be delisted completely but find this sort of situation to be grossly unfair.