I'm sorry - but that's part of owning a business. There's gonna be stuff you miss, mistakes you make, etc. Coming someplace you've admitted you've never been before, and claiming they need to 'change' because you're upset is just silly. You have not idea how the moderation works here, so how can you claim it needs to 'change' or 'improve'? For example, look at the down votes I'm accumulating trying to explain this to you. Also, note we're responding to each other with no problems. So it would seem a bit unfair to blame HN...
As for 'check every site possible' - you should probably be checking the ones you care about on a regular basis. For instance, googling your company name (a 'vanity search'). HN is actually pretty small potatoes compared to FB, Twitter, Yelp!, etc. You might want to check those sites too. And I kid you not, there are companies will 'manage your online reputation' if you would prefer to just outsource it.