Relentless resourcefulness is the phrase.
If you're pushing the boundaries of ethics, you have to realize that what is considered acceptable in one (sub) culture may be grossly unacceptable in another.
What is considered "business as usual" in one culture or industry will be seen as corruption in another culture or industry.
Now, there are a lot of inconsistencies and hypocrisies in our cultures. So, if you look around, you're bound to find strange inconsistencies. That's normal.
In short, for any culture, there are some forms of cheating that will be mostly tolerated or even glamorized, and others that will be seen as despicable.
What you've described is despicable, from a mainstream US / Canadian / Anglo perspective. It does not appear resourceful, at all.
I.e. is it "cool, those guys are smart and they're bucking the system" or is it "these guys are slimy and I never want to do business with them."
Again, I'm not condoning unethical behavior, nor am I so naive to believe that it isn't widespread. I'm just stating that what is a "nudge-nudge-wink-wink-everyone-does-it" infraction versus what is a "omg, you lying bastards" is culturally relative.
The OP's example falls into the "lying bastards" category for me, and for most of the companies I've worked for.
Not all methods are equally ethical.
So how did you get hold of them in the first place? Why won't they simply ignore you?
I've had lot of success after sending intelligent comments to articles in mainstream media. Journalists respond back, more often than not.
Form letters get ignored - personal emails less so.
Choose your words carefully when approaching these guys. It might take a extra time, but the end result is worth it.
Just work harder.
Also, what would you suggest to do with the bloggers I've already contacted? Maybe I could use the "new version launched" as an opportunity to contact them again?
As for emails - really, just look for journalists who've written on your subject in the past. They usually have contact details up there.
> "Choose your words carefully when approaching these guys." That's the hard part. Any examples? Or reference to articles that I could read and improve?
The best advice I can give is make sure you know who you're writing too, what their blog is about. Perhaps include a link to a relevant article in their blog (always use it in plain text form, bloggers love having their ego's stroked)
If you need an example, I guess a very rough one is something like.
----------------
Hi there .....
My name is ..... and I'm from ......
I've been reading your blog for ..... months and an article of yours that caught my attention was the one about .....
(link to article in plain text form)
My company does ..... and this is along the same lines as ......
I thought this might be of interest to your readership.
Anyway, thanks for taking the time to read this email. If you would like to get back to me my contact details are in the footer.
Thanks!
Name
It should be so insightful that they should feel that it would have been a better article had they spoken to you before writing it.
They don't have too much attention span. They don't care about how hard/easy it is do, or even if it is true or not. They just care about interesting stories...
For one of my stories I told them that we did some survey and just made up the findings. They loved it and published it next day without looking at my data or even asking me methodology of survey/research