I have a free app on the store that's only just launched. So at the moment its flying up and down the charts (I've managed to hit the top 200 for FREE iPad Apps

)
Today I looked and out of nowhere it had over 700 1-star ratings.
This is almost certainly a deliberate attack, because firstly that's a very big percentage of my users to be leaving ratings. Secondly, they are ONLY 1 star ratings, there no 2-star, no 3-star, a couple of 4-star (genuine) and a few 5-star (genuine).
700 ratings is more than Apple's current version of their "Remote" app which has been on the store for years and is certainly more popular.
The paid version of the app (which has nearly identical functionality and quality) has no 1-star reviews (because they'd have the buy the app to leave a rating/review).
It's just the same when you see an app that's been online for less than 1 day with 2000 5-star ratings and reviews.
What is going on?
Who is doing it?
Why hasn't Apple done anything about it?
I have contacted iTunes through iTunes Connect about this but I'm doubtful they'll do anything.
Anybody else had the same problem?