What's funny about that is tracing back through your recent history gives a post that I would consider sniping.
Twice you've commented that traffic has dwindled and people no longer comment - that's funny - almost 1,000 posts this week which is above the usual average, and we're in between ABL and NBL seasons.
You raise the IP issue, but people are NOT posting from community access points. It's schools and home computers.
If you are upset about a post, use the mechanism provided to lodge a complaint.
Back to the topic at hand, if the company feels that people have done them harm, pursue those that made the comments.
If you read the comments they are upset about, like I said, all seem like pretty legitimate criticisms to me.
Before long, it will be illegal to write a bad review about something. Peter Costello recently said that the government would legislate to stop community groups and others from boycotting companies for a cause such as the environment, a minority, etc - that is absolutely incredible.